Strength of schedule is calculated from the opponents projected fantasy points allowed for the RB position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
There were very high expectations for Williams as he was drafted in the 2nd round of the 2011 draft by the Cardinals. But he's never been the same since suffering a ruptured patella tendon during a 2011 preseason game. But after impressing the Cowboys during a May workout Williams was signed. He has a lot to prove as he was inactive for all 16 games last season but early word is that he looks healthy and has a chance to enter the 2014 season as DeMarco Murray's backup. We're a long way from there, but he needs to be on your radar.