The Buffalo Bills’ defense is undergoing a dramatic transformation in 2026, and the latest development could hand them a savvy, low-risk addition that feels like a homecoming.

After years of frustration where the unit repeatedly prevented an otherwise potent offense from advancing deep into the playoffs, Buffalo made the tough but necessary call for change. Sean McDermott was relieved of his duties, Joe Brady was elevated to head coach, and Jim Leonhard was brought in as defensive coordinator. One of the most significant schematic shifts is the move from a nickel-heavy 4-2-5 alignment to a base 3-4 defense. While the switch brings both pros and cons in terms of personnel fit and versatility, it represented a clear acknowledgment that the status quo was no longer working.

A key piece of that reboot became official recently: Greg Rousseau, the towering 6’6″, 260-pound edge defender, is transitioning from defensive end to outside linebacker in Leonhard’s new system, according to reports citing The Athletic’s Joe Buscaglia and confirmed by GM Brandon Beane.

This positional adjustment creates an immediate opportunity at edge rusher — and it just so happens to align perfectly with the availability of a familiar, productive veteran.

A.J. Epenesa Remains Available After Browns Deal Falls Apart

A.J. Epenesa, who has been with the Bills since being drafted in the second round in 2020, appeared headed to the Cleveland Browns on a one-year deal worth up to $5 million, as first reported by Adam Schefter. However, just days later, ESPN’s Daniel Oyefusi reported that Cleveland backed out, uncomfortable finalizing the agreement after Epenesa’s physical.

Epenesa is once again a free agent, and the Bills are in a strong position to bring him back for what would essentially be a third chapter in Buffalo.

The 6’6″, 260-pound defensive end (listed at that size) has proven himself as a reliable rotational pass rusher who knows the organization, the city, and the expectations. From 2022-2024, Epenesa averaged around six sacks per season while playing primarily in a rotational role. He consistently generated pressure and contributed solid run defense with a handful of impactful tackles for loss and hits in the backfield.

His production wasn’t flashy every snap, but it was steady — exactly the kind of veteran depth that can stabilize a defensive line while younger or drafted talent develops.

Why a Reunion Makes Sense for the Rebuilt Bills Defense

With Rousseau sliding to outside linebacker, the Bills suddenly have a clearer need for proven edge depth behind (or alongside) their starters. While the team is widely expected to target edge rushers in the upcoming NFL Draft, adding Epenesa on a modest, incentive-laden contract would provide immediate veteran insurance and scheme familiarity.

Epenesa already understands how to play in Buffalo’s environment and has shown he can be a disruptive force in limited snaps. At a price point similar to what the Browns were offering (up to $5 million), it represents excellent value for a player who has delivered consistent pressure without commanding top-tier starter money.

Of course, the final decision will hinge on whether Leonhard believes Epenesa fits his aggressive 3-4 vision. Leonhard’s scheme emphasizes versatile outside linebackers who can rush the passer while also handling some coverage responsibilities, though Rousseau’s transition suggests the new coordinator is willing to tailor roles to maximize athletic strengths. If Epenesa checks out medically and schemes up well, a reunion could be a low-risk, high-reward move that bolsters the pass rush without breaking the bank.

The Bills’ offense has been putting up close to 30 points per game in recent seasons. For Buffalo to finally break through in the playoffs, the defense must step up. The combination of a new coordinator, a fresh scheme, Rousseau’s positional versatility, and the potential return of a known commodity like Epenesa signals that the reboot is gaining real momentum.

Bringing back the 6’6” sack artist who already knows the system could prove to be one of the smartest, quietest “steals” of the offseason. If Leonhard gives the green light, Buffalo fans might soon be cheering a familiar face helping anchor a revitalized defense.

The 2026 season is shaping up to look very different in Orchard Park — and for the first time in a while, that difference feels like a step in the right direction.