Who will emerge from crowded Bills running back room?

Cook’s arrival crowds the Bills’ backfield, though it should boost the unit’s passing-game capabilities. Cook is signed through 2025, making the Georgia product the long-term centerpiece of the Bills’ backfield. Singletary’s rookie contract runs through 2022, making this a critical year in his career. While he should be expected to start ahead of Cook and lead Bills backs in playing time while ceding some ground to the rookie in the passing game, there is a difference between that and a notable extension.

The 2023 running back free agency class could be one of the most interesting in recent NFL history. That market stands to include Saquon Barkley, Josh Jacobs, Kareem Hunt and Damien Harris. Not all of them will necessarily hit free agency, as teams’ efforts to keep 2017 draftees off the market showed. But some will. Singletary would not be the highest-profile back here, but he has been a solid per-carry producer (4.7 over three seasons) and has not — to this point — been given full workloads. The former third-round pick is sitting on 495 carries through three seasons.

Given ball-carrying veterans’ frequent issues on the market, it would not surprise if Singletary could be retained on a midlevel accord to pair with Cook beyond 2022. Zack Moss may have a say in that possibility, however. Phased out down the stretch last season, the 2020 third-rounder could enter 2022 facing a wide range of outcomes. A solid camp could put the power back in line to remain in Buffalo’s committee, but Buscaglia notes a trade before the season should not be ruled out.

Buffalo also signed Duke Johnson this offseason after a failed effort to add J.D. McKissic. Moss falling further out of favor would benefit Johnson, who signed for just $378K guaranteed. However, Moss and Johnson’s skillsets do not exactly overlap. Johnson could supply depth for a backfield that promises to have more options than it has over the past two seasons.