Klein has been a part of the Bills defense since 2020. He was a solid depth option at linebacker and even earned defensive player of the week during one of the six games he played with the Bills last season.
As a veteran player with nine years under his belt, he can help provide a lot of experience for younger players, who the Bills have a lot of, especially in the linebacker position. So don't be surprised if Klein is one of those players who are added to the practice squad and eventually gets added to the 53-man roster.
Right now, our quarterback depth chart consists of Josh Allen, and Kyle Allen due to Matt Barkley being placed on IR. The Bills would probably want to sign a third-stringer for quarterback depth. Mainly someone who's a young dual-threat who can play in a pass-heavy offense.
Grier showed that he has the potential to do that during his famous four-touchdown performance over the Vegas Raiders this Sunday, which was said to be his "audition game", as the Cowboys told him prior to the game that he was going to be released no matter how well he performs.
Grier will most likely be picked up by a team in free agency, and due to the Bills's need for a third-string quarterback, they are a likely candidate.