When the Philadelphia Eagles finished the 2022 season ranked 2nd in defensive DVOA, much of the credit rightly went to a historic pass rush — 70 sacks, the third-most in NFL history through the regular season. But the coverage data tells an equally important story about how Jonathan Gannon built that defense, and it reveals a coordinator whose scheme evolved meaningfully over the course of the year in ways that go beyond the box score.
The most basic finding confirms what film study already suggested:
this was a zone-based defense at its core. On early downs, the Eagles played zone coverage more than three times as often as man (42.48% to 12.26%), with Cover 3 alone accounting for roughly one in five snaps — comfortably their most-used single call all season.
This wasn’t incidental. A Cover 3-heavy approach is the schematic signature of the Fangio-tree defenses Gannon came from, prioritizing depth and disguise over individual matchup wins. The selection of Cover 4 and Cover 1 as secondary options, rather than more aggressive looks like Cover 0, reinforces that this defense was built to prevent explosive plays first and create havoc second.
What’s more revealing is what they avoided entirely. Cover 2 Man didn’t appear on a single early-down snap across 824 plays. That’s not a statistical quirk — a defense that runs six different coverage shells over an entire season doesn’t accidentally skip one of them 824 consecutive times.
It points to a coordinator making a conscious philosophical choice, likely because Cover 2 Man asks corners to sustain difficult trail-technique man coverage while still respecting deep halves’ responsibility — a demanding teaching point that may not have suited Gannon’s personnel or his risk tolerance.
Perhaps the most significant trend in the data is the clear directional shift from the first half of the season to the second. On early downs, man coverage cratered — falling 41%, from 15.5% in Weeks 1-9 down to just 9.2% in Weeks 10-18.
Cover 0, the most aggressive man-coverage call in the playbook, nearly disappeared entirely, dropping from 2.5% to a mere 0.47%. Third down followed the same arc: blitz rate fell 22% from the first half to the second (21.05% to 16.41%), with two separate weeks — 9 and 13 — featuring zero third-down blitzes at all.
This pattern is worth noting because it cuts against a common narrative about good defenses needing to “evolve and adjust” as the season progresses. Here, the evolution ran toward simplicity and restraint, not complexity.
One interpretation is that Gannon found his players were more effective executing fewer, better-rehearsed calls than mixing in higher-variance, higher-risk concepts — a defense optimizing for consistency over surprise as familiarity within the system grew.
Another explanation is one of survival and game-script: the Eagles spent much of the second half protecting leads, and conservative zone shells are simply the correct call when you’re playing with a cushion.
The Week 8 performance — a season-high 29.63% Cover 3 usage following the bye week — looks like the moment this second-half identity crystallized into a template the staff leaned on for the rest of the year.
Situational Aggression on Third Down
Even as the defense trended conservative in the aggregate, the splits between early downs and third down reveal a coordinator who understood situational football.
Man coverage usage on third down (25.56%) was more than double the early-down rate (12.26%) — a clear signal that Gannon was willing to ask his corners to win one-on-one matchups specifically when the stakes were highest and offenses needed a defined number of yards.
This is a fairly conventional approach league-wide, but it’s notable how disciplined the split was: the Eagles weren’t bleeding man coverage into early downs at meaningful rates; they were saving it almost exclusively for third down.
That’s evidence of situational discipline rather than randomness — a defense that knew exactly when to take on greater individual risk.
Week-to-week trends
The risk in any season-long trend analysis is flattening out what was actually a much bumpier ride week to week, and the data here makes that clear. Despite the broader conservative drift, the Eagles swung wildly from game to game.
Week 2’s third-down man coverage rate hit a season-high 58.33%, paired with a season-high-tying 33.33% blitz rate — about as aggressive a defensive gameplan as Gannon called all year. The very next week, Week 3, that approach reversed almost entirely: just 11.76% man coverage, 76.47% zone, and a season-low 5.88% blitz rate.
That’s not a defense drifting gradually — that’s a coordinator making a deliberate, opponent-specific decision to flip the script entirely from one week to the next.
This volatility matters because it complicates the idea of “Gannon’s defense” as a single, fixed identity. The aggregate numbers tell a story of zone-heavy conservatism that deepened as the season went on, but the week-to-week numbers tell a story of a defense being actively game-planned against specific opponents, with the coordinator willing to dial aggression up or down dramatically based on matchup, personnel health, and what that week’s opposing offense was built to exploit.
Week 8’s season-high blitz rate (41.67%) and Week 15’s near-equal mark (38.46%) both stand as proof that the second-half “conservative” label wasn’t absolute — Gannon was still capable of calling an aggressive game when the situation demanded it.
What does this say about Gannon?
Taken together, the data supports a more nuanced read of Gannon than either side of the public debate about him usually allows. He wasn’t simply “too passive,” as some critics argued throughout 2022 — the third-down man-coverage rates and the spikes in blitz aggression in specific weeks show a coordinator capable of asking his defense to take risks when the situation called for it.
But he also wasn’t a chess master constantly innovating new wrinkles — the season-long drift toward zone and away from blitzing suggests a defense settling into its most repeatable, lowest-variance version of itself as the year went on, trusting disciplined execution of a smaller menu of calls over an expanding one.
That’s consistent with everything else we know about how Gannon talks about his own scheme: that it should adapt to personnel and game state rather than chase complexity for its own sake.
The 2022 Eagles had the rare luxury of an elite four-man pass rush, which meant the defense didn’t need to manufacture pressure through blitzing or live-or-die on man-coverage matchups to be effective. The coverage data simply confirms what that personnel advantage allowed Gannon to do: get more conservative, not less, as the season progressed — and still finish 2nd in the league.
