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Bills defense not better, but certainly different, in 2026

The Buffalo Bills’ defense has undergone a dramatic shift in 2026, trading the aggressive, nickel-heavy schemes of the Sean McDermott era for a more traditional, personnel-based approach under new head coach Joe Brady and defensive coordinator Jim Leonhard. Through six weeks, the unit has struggled statistically, ranking 30th in EPA per play allowed, 28th in EPA per dropback, and 28th in success rate against opponents—markedly worse than their 2025 finishes, when they placed 14th in EPA per play and 8th in EPA per dropback.

While the Bills have shown slight improvement against the run (25th in EPA per rush, up from 31st last year), their pass defense has taken a significant hit, with a league-leading 26% of snaps spent in cover 4 and an average of 7.13 defenders on the field—both departures from McDermott’s era, when base defense usage rarely exceeded single digits. The shift away from nickel-heavy looks, once a hallmark of the Bills’ defensive identity, reflects Leonhard’s emphasis on structural adjustments, though early results suggest the transition has come at the cost of overall effectiveness.

The Bills’ defensive overhaul extends beyond personnel grouping, with coverage schemes now prioritizing cover 3 and cover 4 at rates well above the league average. While the team’s run defense has seen modest gains, the pass rush and overall pass coverage have faltered, contributing to a defense that, despite its new look, remains among the league’s least efficient.

The departure from Taron Johnson’s nickel-focused philosophy—central to the Bills’ defensive identity for nearly a decade—has left fans and analysts questioning whether the stylistic changes will yield long-term success or further regression in 2026.

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