In a series of articles over the next few days, Football Outsiders will be looking division-by-division at the biggest weakness left on each team's roster after free agency and the 2015 NFL draft.
This edition examines the AFC East.
Buffalo Bills
Biggest post-draft weakness: Quarterback
In five seasons with the Jets, Rex Ryan never had a quarterback who ranked higher than 28th according to Football Outsiders' DVOA ratings. (DVOA, or defense-adjusted value over average, is explained further here.) Now he comes to a team with a third-year quarterback (EJ Manuel) who ranked 37th and 38th in his first two seasons, and a veteran quarterback (Matt Cassel) who has been just as bad in four of his past six seasons. Regardless of how much blame Ryan deserves for Mark Sanchez's failure to develop in New York, he has even less to work with at the position right now in Buffalo.