The final player is La'el Collins, who surprisingly was released by the Cincinnati Bengals in September after he began the season on the PUP list. Collins suffered a torn ACL and MCL last season and has been rehabbing and trying to work his way back.
According to Jordan Schultz, La'el Collins was medically cleared earlier in October and is now looking for his next team. The Bills tackle duo of Dion Dawkins and Spencer Brown have done a pretty good job to this point and should remain the starters for the rest of the season.
The reason the Bills should consider signing Collins is that the depth behind these two is very inexperienced. Ryan Van Demark hasn't played in an NFL regular season game before this season and has played only 25 snaps through the first eight games. The other tackle is rookie Alec Anderson, who was an undrafted free agent signing last year by the Bills.
If the Bills were to sign La'el Collins, it would allow him to continue to rehab his knee as he wouldn't have to play right away. For the Bills, it would give them an experienced backup that could step in if the need were to arise.