I could see 3 of these players being cut, but I don't know about 4.
Vlad Ducasse. With Groy being our top back-up G, and if Jordan Mudge steps up throughout the preseason. Ducasse could easily be cut.
Ryan Davis. Eddie Yarbrough appears to be Davis' main competition. Possibly Max Valles as well. DE depth is thin, and Davis being a veteran helps him, but he's not a lock.
Andre Homes. WR is crowded, and Holmes has been underwhelming in practice. However, his Special Teams play could be the deciding factor for him. I think he will get every chance to make the team. Having Holmes as a 4th option, is not a bad thing.
Steven Hauschka. Reports(from Astro) are he is having a good camp. Competition for K is non-existent. He stays.
Patrick DiMarco. Do the Bills keep 2 FB's or 4 TE's? Mike Tolbert could end up being the starter, but DiMarco is younger and has good experience. I think DiMarco stays.
Jordan Poyer. Poyer is unspectacular, but there isn't much else at the S position. Unless Baccari Rambo has really stepped his game up and proves he can start, Poyer is going nowhere.
Micah Hyde. Please.