Arizona Cardinals RBs Ryan Williams and Mendenhall are both out with knee issues. Williams is in crutches and is suffering from complications in his patella tendon which was surgically repaired August 2011. One has to wonder if he will ever fully recover. Mendenhall is expected to be back soon, but this may open up chances for RB Stepfan Taylor to run with the first team and prove himself. Keep an eye on him.