Achilles' heel: Getting off the field on third down
I'll start by suggesting that the recent panic about the Bills' defense being a sieve is likely overblown. Through Week 13, the Bills ranked eighth in the league in EPA per play and points allowed per possession on defense, and nobody seemed to be too concerned with what coach Sean McDermott was doing then. Buffalo ranks 31st in both metrics since then. Although the Bills didn't allow 40 points for the
third consecutive week in Sunday's
win over the Patriots,
Drake Maye and a limited New England offense still managed to rack up 379 net yards on 10 drives.
Ranking 31st is bad, but I'm willing to chalk up at least some of that to missing personnel in the secondary, including cornerback
Rasul Douglas and starting safeties
Damar Hamlin and
Taylor Rapp, all of whom were out Sunday. Linebacker
Matt Milano was also out against the Pats. All four should be back in January, when the Bills hopefully won't be calling on
Kaiir Elam and
Cole Bishop for regular work.
The biggest issue for this defense all season, even before the recent struggles, has been on third down. Buffalo is allowing teams to convert more than 44% of their third downs into first downs, which is tied for the third-worst rate this season. Over the past three games, that has jumped to 60%, with the Patriots going 7-of-12 on third down and 2-for-2 on fourth down as they tried to extend drives against the Bills.
Let's try to break down where the issues lay by starting where they're not. The average third down against the Bills comes with 7.2 yards to go, which is just above the league average of 7.1. A lack of pass pressure on what is typically a passing down can cause problems, but that hasn't been the case for McDermott's defense. It has a 9% sack rate on third downs, which is just below league average but hardly cause for concern. The Bills actually create quick pressures (within 2.5 seconds of the snap) at the sixth-highest rate of any defense on third downs. The issue has been finishing the job: Buffalo has 10 unblocked pressures this season on third down, but none has produced a sack. The rest of the league has converted about 19% of those unblocked pressures to takedowns.
A more plausible case is the Bills are too passive on third down and aren't quite as sticky as they were in coverage on third downs in previous seasons. Buffalo's philosophy on third down is relatively predictable: It rushes exactly four at the league's fifth-highest rate, blitzing at one of the lowest rates. It also plays zone coverage at the fifth-highest rate, as a relatively inexperienced secondary plays man coverage on third down only about 33% of the time.
It's tough to create narrow windows for quarterbacks when defenses play heavy zone coverage, and the Bills haven't done that this season. Just 11.3% of throws from opposing quarterbacks on third downs have gone into tight windows against them, the third-lowest rate for any defense. The Bears, Dolphins and Buccaneers, three of the league's most zone-heavy defenses, also rank in the top five in the same category.
NFL Next Gen Stats characterizes tight-window throws as passes that arrive with less than 1 yard of separation between the receiver and the closest defender. The Bills don't allow a lot of wide-open throws -- they're well below league average on the percentage of throws that arrive with 3 or more yards of separation -- but they're allowing more throws with moderate amounts of separation, throws in that 1-to-3-yard range, than any other team.
Receivers are simply squeezing into those spaces and picking up first downs. The Bills have allowed 91 more yards after catch than would be expected by the Next Gen Stats model on third downs this season, the eighth-most of any defense. With Buffalo playing split-safety coverages at one of the highest rates in the league on third downs, there's space to operate underneath. There's no one single glaring issue, but this team is just a little worse than it would like to be rushing the passer, allowing opposing offenses a little too much space before the catch, and hasn't been quick enough to bring players down afterward. The combination of those factors has led to a difficult time on third downs.
The hope has to be that a
healthy Milano will fix some of those issues with his tackling and instincts for reading route concepts, but the linebacker being healthy is hardly a guarantee after he missed 22 consecutive regular-season games with various injuries. His return to the lineup in the snow-day
victory over the 49ers was also followed up by two of the worst Buffalo defensive performances of the season, after which he missed the Patriots game with a groin injury. I wonder if the Bills might have just shut their star linebacker down for the rest of the regular season in the hopes of having him on the field come the postseason. With
Baylon Spector suffering a calf injury against the Patriots, though, McDermott likely will need Milano down the stretch.
Team to avoid: Kansas City Chiefs. I know the Bills
beat the Chiefs earlier this season, but I'm also sure Buffalo fans don't need to be reminded of how things can be different when these two teams play in the postseason. Even in that victory last month, Kansas City managed to go 5-for-10 on third down. Over the full season, the Chiefs have converted on a league-high 51% of their third downs.
Just eight teams have converted more than 50% of their third downs during the regular season since 2000, including the
2021 Chiefs. While that Kansas City team didn't make it to the Super Bowl, it went 8-for-13 on third down in a legendary 42-36
divisional round victory over the Bills.