26-year old OT Brad Butler has shocked the Bills by announcing his retirement from the NFL yesterday.  He played in only 2 games (both starts) last season for the Bills missing most of the season due to injury.  Butler played in 33 games (31 starts) in his four years with the Bills.  The Bills will have to find a new starting right tackle for the 2010 season which is a hole they weren’t anticipating having.