The Buffalo Bills have made some notable changes on their roster, although the core of important players on offense and defense are still here.

Josh Allen, Stefon Diggs, Devin Singletary, Dawson Knox, Dion Dawkins, Matt Milano, Tremaine Edumnd, Tre'Davious White, Micah Hyde and Jordan Poyer are all back for the 2022 regular season.

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The Bills also signed star edge rusher, Von Miller to add the most glaring missing piece to the Bills championship-ready roster.

They also signed defensive tackles Tim Settle and Jordan Phillips, guards Rodger Saffold and David Quessenberry, running back Duke Johnson, tight end O.J. Howard and wide receiver Jamison Crowder.

The Bills made a trade as well, which landed them their new backup quarterback for Josh Allen.

Buffalo lost 2021's backup Mitch Trubisky in free agency (Pittsburgh Steelers) and general manager Brandon Beane traded for the Cleveland Browns' backup, Case Keenum in March.

Keenum is no stranger to NFL starts and adjusting to a change of scenery. The 10-year NFL veteran has been on seven teams over the course of his career.

He went undrafted in the 2012 NFL Draft, after breaking the record for most passing yards, completions and touchdown passes in FBS college history at the University of Houston.

Keenum proved teams wrong after not going drafted, as he became one of the best backup quarterbacks in the NFL, even leading the Minnesota Vikings to the NFC Championship game in 2017 -- which was the Cinderella story that season.

Keenum is not a quarterback with a huge arm or size/athletic ability, but he has seen every offensive playbook possible, and that includes a pass-heavy offense -- he ran that in college.

It was a perfect quarterback to be behind Josh Allen. Not only because of Keenum's experience and past performance, but he is former teammates with Stefon Diggs in Minnesota.

Keenum and Diggs connected on the most miraculous NFL playoff moment in history against the New Orleans Saints in the 2017 NFL Divisional round. It was deemed the "Minneapolis Miracle."

The Bills also brought back Matt Barkley to be the third-string quarterback on a one-year deal. Barkley is close friends with Josh Allen and well liked in the Bills locker room, so him being brought back is not a surprise as well.

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