'The Bills, despite having as run-heavy an approach as you'll find in 2015, did not have enough room to keep five running backs on the active roster heading into the season. LeSean McCoy is the bellcow, Karlos Williams is the impressive rookie that has received rave reviews, Anthony Dixon is a versatile special teams player, and Bryce Brown has flashed some ability despite fumbling problems. They couldn't afford to keep five, and Jackson was the odd man out.'