In 2015, Karlos Williams was one of the most surprising rookie performers. A fifth-round pick out of Florida State, Williams served as the primary backup to LeSean McCoy with the Bills. In that role, he was fantastic, generating 517 yards and seven touchdowns on just 93 carries while also adding two TDs through the air. He looked like the potential successor to Shady and at the very least had long-term upside.
However, following his last game, things went off the rails for Williams. He showed up ahead of the 2016 badly out of shape and was suspended for the first four games of the season for violating the league’s substance abuse policy.