The Bills hoped Williams would reprise his role as a smash-mouth accompaniment to LeSean McCoy. As a rookie, Williams earned 517 yards on just 93 carries (5.6 yard per tote average) and seven rushing touchdowns. Among all players with 90-plus carries last season, Williams had the second-highest yards per rush in the NFL in 2015. Buffalo will have to wait at least four weeks to see if he can duplicate that production.