When the Bills evaluate their run defense from this season, this is likely to stand out: Opposing teams had much more success running to the offensive left than they did the offensive right. On runs to the right, the Bills allowed 4.19 yards to the right edge (5th in the NFL), 2.96 yards to the right tackle (5th in the NFL), and 3.38 yards to the right guard (8th in the NFL). On runs to the left, the Bills allowed 6.77 yards to the left edge (31st in the NFL), 6.3 yards to the left tackle (32nd in the NFL), and 4.89 yards to the left guard (27th in the NFL). Since the Bills flipped personnel from one side of the formation to the other, it's tough to pin the problem on one or two players. Instead, plays like Bobby Rainey's 80-yard run in a loss to the Tampa Bay Buccaneers may have skewed the average for runs to the left.