With his high salary, and production-to-date, Pears looks like a goner next year, and Welch looked poor in pre-season. The Bills need to find at least two backup tackles for next year, and, depending upon Hairston's recovery prognosis, maybe a starter as well.
Legursky has to be replaced in the starting line-up, if not altogether bumped from the team, opening up one-to-two more spots that need to be filled.
With three-to-five spots to fill, the Bills have to keep churning the backup slots with the likes of Unga, McClain, and Asper, or they'll be spending the entire draft on one area of the team.