The Arizona Cardinals have lost Ryan Williams for the rest of the season to a shoulder injury that will require surgery. Replacing Ryan Williams may seem like a daunting task, but losing his 2.8 yards per carry and zero rushing touchdowns is not as bad as it may seem. Arizona has been terrible this year running the ball. Some of the blame for that goes to the offensive line, but Williams has a distressing tendency to dance around behind the line and try to break runs outside, which results in losses more often than not. Williams was the feature back in Arizona before his injury, now Coach Ken Whisenhunt plans to platoon the three running backs left on the roster to replace him. LaRod Stevens-Howling is coming back healthy, and looks forward to taking his spot in shotgun sets and as third down running back. William Powell, who led the preseason in rushing, will get a chance to prove himself as an NFL quality back. Lastly, Alfonso Smith is back, cut in the preseason after losing his spot to Powell, Smith knows the Arizona system well and looks to contribute in the Cardinals depth deprived backfield.