How Chris O’Leary’s aggressive, pressure-forward defense is diverging from Jesse Minter’s, and why that divergence is exactly what Mike McDaniel needed in a defensive partner.

When the Chargers went from losing Jesse Minter to landing Chris O’Leary it read like another defensive mind pulled from the same Baltimore coaching tree to run the same defense that finished third in scoring over the past two seasons. However, as I detailed in my breakdown of the Chargers’ new hire, that wasn’t going to be the case and the tape, three preseason games in, back up my initial expectations. O’Leary’s version of the defense looks like something closer to a philosophy change: a defense built on patience and structure being handed to a coordinator whose instinct is to go take the ball rather than wait for the offense to give it up. What follows is a look at why that shift happened, what it actually looks like schematically, and why the aggression O’Leary has shown this preseason reads like a better fit for the vision Harbaugh committed to once he pursued the Mike McDaniel experience.

A System Which Was Never Built to Whisper

Chris O’Leary’s high ceiling as a play-caller has a lot to do with how naturally his instincts fit the machine he inherited. In Mike Macdonald’s modular scheme, the pressure package is at the forefront of the play call; everything else is built downstream of that. That structure was intentional as ‘The Baltimore System’ was built on the founding principles of Wink Martindale and Rex Ryan, and neither of those coaches ever designed anything meant to be subtle. Jesse Minter leaned into that identity more as his Chargers tenure went on, but his aggression never really matched the origins of the scheme he championed. Then again a significant part of his conservatism can be attributed to his arranged partnership with offensive coordinator Greg Roman.

Jim Harbaugh has built a career on turning poor rosters into good ones quickly because he understands the two things that actually win football games regardless of talent: the clock and the scoreboard. Pairing with Roman was Harbaugh committing to winning in slow measures. He would control time of possession on offense, and earn that control by being preventative on defense. Minter’s job, then, was to suffocate offenses by taking away however his upcoming opponent liked to win. He obsessed over getting his play-calling as close to perfect as possible by studying the opposing coordinator; it’s almost like he knew what an offense was going to do before it did. Ask a data analyst how the Chargers finished with a top-10 defense and they won’t have a clean answer. Ask an opposing play-caller and they will.

“I just pretty much take on the personality of the team wherever I go. The love Derwin James has for football, I gravitated to that immediately. The humble warrior Khalil Mack is, everything about Justin Herbert. The toughness, competitiveness and confidence of our players, I want to take on a little bit of that. I want a lot of that in my personality and in my life to keep going. It’s infectious.”

Jim Harbaugh on how he turns teams around

That’s the best thing about the Baltimore coaching tree’s defense at its core: it’s a method of installation that transcends any one style. Minter’s anticipatory, structure-first approach was just one of the ways the system can manifest itself. It fit a team that needed to win with the clock more than the scoreboard. But that wasn’t enough. The Chargers’ failure to pair Minter with an offensive coordinator who could reliably win with the scoreboard exposed the ceiling of that approach. For two straight years, his defense put the team in position to win in the playoffs, and both times the offense wasn’t elite enough at anything to finish the job. The lesson for Harbaugh was painful but clarifying: a conservative, consistent style only wins a championship when its stars are genuinely transcendent.

The Pursuit of a Missing Gear

That lesson is what sent Harbaugh after Mike McDaniel. The story of that pursuit has been told well elsewhere, always arriving at the same conclusion: the Chargers needed to start taking the fight to their opponents and the opportunity McDaniel represented was too good to pass up especially when held against the backdrop of the playoff failures. Harbaugh was tired of standing hunched over on the sideline, unable to control the outcome. Time is always running, even with the play clock turned off, and Harbaugh realised he needed coordinators who still had the fire that time has started to wear off of him.

Chris O’Leary is the less-told half of that same story. To my eye I think his brand of football is the final piece of the puzzle: his attitude weaponizes the Baltimore system in a way that complements McDaniel on every single level. Honestly, I think Minter’s version of the scheme would have not been able to replicate that level of cohesion, even if the Chargers had somehow kept him. O’Leary’s single season at Western Michigan is the proof of concept. Turning that roster into one of the best defenses in the country was a mountain on its own, but what stands out most is how he did it: through relentless energy and positivity rather than a siege mentality.

Plenty of coordinators can galvanize a group by making it us-against-the-world; far fewer can install an attacking mindset while staying a smiling, approachable presence on the sideline, because that combination usually depends on the fragile authority of being the abrasive guy in the room. O’Leary loves football the way all the best coaches do; that love shows up as both hunger to learn and genuine joy in watching the plan work.

Harbaugh’s loaned-out playcaller pipeline, the same one that produced Mike Macdonald and then Jesse Minter, paid off again. O’Leary was waiting for the moment opportunity and timing lined up, and when Minter’s departure coincided with McDaniel’s sudden availability, the pieces fell together in the space of two days. Harbaugh’s vision for the second iteration of the Chargers under his watch will therefore be a more assertive force powered by weaponised form of optimism. This to me fits both the roster and the man who Jim is at this stage of his career; his charm is his best asset so its only right that his coordinators reflect that as they look to swim in one direction towards the Lombardi trophy.

A Shared Approach, On and Off the Field

As highlighted earlier; winning football comes down to two metrics; time and points. Minter and Roman tried to win by grinding a game down possession by possession until the clock did the work for them. McDaniel and O’Leary will look to win both frontiers at once, and the reason isn’t chemistry in the abstract, it’s a mechanism that runs in both directions across the ball. An offense that can manufacture explosive plays gives a defense permission to gamble. If a corner jumps a route and misses, or a blitz gets picked up clean and burns a linebacker’s assignment, the coordinator doesn’t have to coach scared of one blown rep costing the game, because his offense can answer with a chunk play of its own. The reverse holds just as well. A defense that can consistently get itself off the field, or better, take the ball away, gives an offense license to sit on a shot down the field in the fourth quarter instead of settling for the safe underneath completion, because if that shot doesn’t land, there’s a real chance the defense hands the ball right back with enough clock left to try again.

That mechanism is also why the actual scoreline from these first three preseason games barely matters. A blitz that gets home clean or a corner who guesses right and jumps a route looks the same on a highlight reel whether the technique behind it was sound or just lucky, and the only way to tell the difference is repetition. What O’Leary is really installing right now isn’t about the end result, it’s timing: when the Sam has to trigger on a crash technique, how long a disguised creeper can hold its shell before declaring run or pass, how tight the coverage behind a three-second pressure actually has to be. Those are muscle-memory questions, not scoreboard questions, and they only get answered by running the aggressive version of the defense over and over until the whole unit trusts its own eyes under stress.

That’s a genuinely difficult dial to turn up mid-game or even mid-career. A coordinator who’s spent years coaching not to lose doesn’t start playing to win just because ownership pairs him with an aggressive offense; the instinct to protect a lead doesn’t disappear because the play sheet changed color. What makes O’Leary and McDaniel work isn’t that they decided to be bold for each other, it’s that both of them were already wired that way before they ever shared a building. O’Leary’s Western Michigan tape was aggressive under circumstances far worse than anything he’ll face in the NFL, and McDaniel’s offenses were manufacturing explosives long before he ever had a defensive partner willing to match him. Two staffs that already default to taking the swing don’t need a season to sync up; they just need the freedom from their head coach to keep doing what they were always going to do anyway.

That shared wiring is what the personality dichotomy is really describing underneath the surface. The mix of positive and aggressive, both McDaniel and O’Leary, is rare in a league still built on a fairly toxic model of masculinity, and I don’t think either trait works as well without the other. Positivity without aggression curdles into a defense that’s fun to play in but never actually takes anything away from an opponent. Aggression without positivity burns a room out by December. McDaniel needed a defensive partner who could hold both at once, not because it makes for a nicer building, but because it’s the only combination that lets each side of the ball actually trust each other’s bailouts week after week without one side quietly resenting how much risk the other is asking it to cover.

That same wiring shows up in how the two staffs actually practice together, not just in how they play on Sundays. An offensive staff that wants to install situational tempo, no-huddle, and manufactured explosive shots needs a defensive staff willing to match that pace in practice, in joint red zone and two-minute periods, and in how aggressively each side is willing to expose its own answers to sharpen the other. A defensive coordinator who defaults to caution in those reps, whether out of personality or scheme, quietly caps how hard an offense like McDaniel’s can actually get tested before Sunday. O’Leary’s whole coaching identity, pressure-forward, front-varied, willing to live with some risk to create some chaos, is built to give McDaniel exactly that kind of week-to-week resistance.

What actually went wrong in Miami.

This isn’t just theory. McDaniel already lived through the version of this that didn’t work, and the mismatch was as much about temperament as it was about coverage shells. Vic Fangio built his reputation the old-school way: relentless, demanding, willing to grind a room down mentally if that’s what it took to get a defense to play exactly the way he needed it to. McDaniel runs the opposite way. He takes the weight off his players rather than piling it on, and the offense in Miami fed off a head coach who was genuinely, naturally having fun with the job. Put those two approaches on either side of the same practice field and you don’t get a complementary organization because the two rooms are operating under completely different environments. McDaniel and Fangio parted ways after a single season, by their own account a mutual and somewhat unexpected decision.

That’s exactly the mismatch Harbaugh has learned to coach away from at this stage of his career. He’s still demanding, the strength program alone tells you that, but the version of Harbaugh running the Chargers is firm without being punishing. It’s the same instinct that led him to pair a positive, aggressive offensive mind with a positive, aggressive defensive one rather than repeating Miami’s mistake of thinking contrast will create harmony. Support and demand aren’t opposites in Harbaugh’s building, O’Leary fits that mold as naturally as McDaniel does.

Chris O’Leary presents himself as a grounded, relationship-driven leader who pairs humility with a strong competitive edge. In his introductory press conference, he emphasized gratitude for the people who shaped him and framed the job as something he takes personally, not just professionally. He comes across as a coach who wants to earn trust, empower his staff and players, and set a standard everyone can take ownership of, rather than relying solely on top-down authority.

From Why Chris O’Leary is not just Jesse Minter 2.0

O’Leary and Fangio share some coverage-family DNA, but they’re near-opposites everywhere else. That gap is exactly where I think this partnership finds its shape, whatever length of time it gets to run.

The Schematic Divergence

Preseason numbers rarely tell you who a defense will be in December, but they tell you plenty about what a coordinator is willing to install when nothing on the scoreboard is actually at stake yet. Three games in, O’Leary’s choices are already in position to be compared to Minter’s baseline, so far the gap between them is wide enough to read without much squinting.

Pressure rate: O’Leary has blitzed on roughly 30% of passing snaps this preseason (29 of 91). Minter’s Chargers blitzed at a 22.9% clip across 550 pass plays last season (126 snaps). That gap is meaningful. It suggests O’Leary is pushing the pressure-forward identity he showed at Western Michigan into the building, even against the game-planning caution preseason usually brings.

Front structure: This is where the split is starkest. O’Leary’s defense has lined up in an odd front on 50.2% of preseason snaps (125 of 249), a huge departure from Minter’s 2025 regular-season odd-front rate of 16.4% (205 of 1,249 snaps), and further still from last year’s preseason number of 13.3% (43 of 323). Whatever O’Leary settles into once the games count, the preseason sample says he’s using camp to stress-test a front identity that looks structurally different from what Minter ran.

Box counts on early downs: The light-box numbers tell a story of aggression tempered by caution, in transition. In 2026 O’Leary’s early-down box splits are 53.1% light, 32.4% neutral, 14.5% heavy (across 145 snaps). Compare that to Minter’s actual 2025 regular-season numbers (57.4% light, 24.5% neutral, 12.6% heavy across 784 snaps), and the real shift shows up in the neutral-box number, which jumps from 24.5% to 32.4%. That reads like a coordinator building in more spacing-based run answers than either Minter’s regular season or preseason numbers (73.7% light, 25.2% neutral, only 1.1% heavy).

On the Ground: Run-Fits and Disguise

The front-usage numbers above aren’t just a geometry change; they carry a different philosophy underneath them. Against 12 personnel, O’Leary has leaned on an Under front out of a Base 3-4, whereas Minter’s answer to the same look was to stay pass-first, using Minus principles out of Even fronts to keep an extra coverage body out of the box. O’Leary is inverting that priority. This showed itself through the first two preseason games, both the Texans and 49ers operate with a zone-run-heavy and O’Leary’s answer from Under has been to send the Sam on a crash technique, squeezing down hard enough to turn the ball back inside, where the defensive line is built to backdoor-cut around their shaded blockers.

That’s a scheme that asks a lot of the inside linebackers, who are left in true single-gap roles and have to read and fit downhill fast; if the Sam’s spill gets swallowed, the ILB’s angle to the ball is already late before the crease even shows. It’s a fit that rewards downhill instincts over space-and-processing linebacker play, and it’s exactly the kind of role that’s suited a veteran like Denzel Perryman and a downhill piece like Junior Colson so far, for what a two-game preseason sample is worth. That same appetite for disguised aggression shows up in the pressure shell too.

Against Houston, O’Leary dialed up an early down blitz concept called Under Cowboy @ Snake with the nickel threatening off the edge as a true force multiplier. Read as a run play, it’s functionally an 8-man box due to the backside OLB making a run-pass read. Read as a pass he would drop back into coverage to create a disguised presentation with the pressure rotating around it. That’s the Al Golden influence showing up in the run game as much as the passing-down menu, stressing the protection picture through disguise rather than simply sending numbers. Between the crash-technique run fits and the run blitzes, O’Leary is putting more of the structural weight on his front seven and taking it off a coverage shell that, under Minter, was built to manage pass-first spacing on early downs.

The Pressure-Concept Evolution

The clearest sign of where this is headed shows up less in the raw blitz-rate number and more in which pressures O’Leary is actually calling, and that picture has sharpened week to week. Through the first two preseason games, O’Leary was mostly running Minter’s own concepts at a different volume. Calls like Sand Deuce, Nail Tracy and Mike Dog are all built to vary with the offensive formation, which makes them chaotic for the opposing quarterback while staying teachable for a defense still installing the playbook. Between them, they accounted for 9 of O’Leary’s 20 blitz calls across those two games. Having spent a season charting Minter’s version of this same language, I could tag almost all of it on sight.

The Rams game broke that pattern. Where the first two weeks were mostly recognizable, I found myself needing to dig into new terminology just to label what O’Leary was calling. The pressure paths leaned heavily on the Odd front, with calls like Under Sam Spin, Odd Sonic and Under Will Boa. Minter had all three of these in his own playbook, but he treated them as change-up pitches for a specific game plan rather than a primary means of attack. Given how much O’Leary has already leaned on Under fronts against heavier personnel, it’s reasonable to expect these paths to become a bigger part of the regular-season menu rather than a situational wrinkle.

What stood out even more was seeing O’Leary start to blend modular components in combinations neither Minter nor Macdonald have called in their own time as play-callers. The clearest example came on the first pressure call against the Rams: third down, the Chargers aligned in an Ali front, a Load front with the Mike linebacker, shaded over the weak-side B-gap. From there, O’Leary called a pressure/game combination named Mike Games Uno that sends Henley through his own aligned gap while the front runs a three-man game to the strong side, with the end wrapping over the top of a two-man pick from the nose and tackle. The real departure from Minter’s version of the same concept was the coverage behind it, not the front or the blitzer. Where Minter always paired this call with strict man coverage, O’Leary ran 3 Lock. Whether that’s a fix for a tendency Minter’s version left exposed or simply O’Leary’s own structural preference is still unclear, but it’s a good sign either way. It shows a young play-caller confident enough to start putting his own signature on the language he inherited rather than running it exactly as it was handed to him. I think this will evolve over time too, O’Leary himself has said that he will evolve the defense as the season goes on:

Reading It Together

The picture is a coordinator who inherited a scheme built on discipline and space control and is actively re-tooling its early identity toward higher pressure rates, a different front geometry, a broader run-fit menu, and, as the sample grows, genuinely original pressure design. Those are the same instincts that turned Western Michigan’s defense around, now being installed with NFL-caliber pieces instead of MAC personnel. It’s worth saying plainly: three preseason games is still a small and noisy sample so how much of this survives contact with real Week 1 game-planning is still very much a live question.

“We want to stop the offense that we’re playing. We’re going to have a great system, we’re going to have great structure but it’s got to evolve and we have to tailor it each week to who we’re playing.”

Chris O’Leary on how schematic flexibility is important to him

However to me, I see a defense that is preparing its players to be aggressive through using the preseason to install the game-paced muscle memory required to time a blitz or a route jump to perfection. Minter had a single game where he was aggressive across two preseasons, O’Leary just used all twelve quarters available to him. Whether O’Leary will start Week 1 with the pedal down to build momentum or save his pressure packages for the brutal seven-game stretch the Bolts will face after hosting the Raiders in Week 2, remains to be seen but I am willing to bet that eventually the dial will be turned up.

Conclusion: Why I’m Confident in This Pairing

Nothing about O’Leary’s tape suggests he’s interested in playing it safe. While Jesse Minter built a defense to minimize mistakes and grind down games, O’Leary has seemingly built his defense to attack. His default instinct when facing a problem isn’t to tighten the screws or remove variance from the equation, it’s to dictate the tempo and force the offense into split-second mistakes. Minter solved problems through anticipation and spatial control, keeping the roof on the defense at all costs. O’Leary would rather trust the roster to survive high-stakes, pressure-packed reps than sit back and let the opposing play-caller call the rhythm of the game.

The contrast between Minter and O’Leary is not only found in the slight disparities in the way they use their talent, to my eye it goes one step further than that. What I see reflects two coordinators answering the same question; How do I gain advantages without exposing my secondary? with different first instincts. Minter wants to slows the game down. O’Leary wants to speeds it up. Minter wins through control of space. O’Leary embraces the chaos of being on the front foot.

From Why Chris O’Leary is not just Jesse Minter 2.0

That’s precisely the profile that makes him the right complement to McDaniel rather than a lesser copy of what came before. McDaniel’s offense wants tempo, manufactured advantages and a partner who will match that energy. That’s exactly the dynamic that never quite existed with Fangio in Miami. Put a play-caller who leads with pressure paths and disguised fronts next to an offense built to create its own explosives, and you get a Chargers team that can win with the scoreboard and not just the clock. That’s what Harbaugh is betting will make the difference when it comes to the playoffs.

The early-2026 numbers have supported my expectations for life under O’Leary; a higher blitz rate, a genuinely different front structure and an aggressive run-fit menu. I’m confident this is the version of Chargers football Harbaugh was chasing when he went and got McDaniel in the first place, and O’Leary is the coordinator built to make it work.

RW

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