More on Mathieu's rookie role

During the pre-draft season, safety prospect Tyrann Mathieu attracted a lot of attention -- despite his off-field problems, he had been one of the more dynamic players on the field for LSU (when he wasn't suspended, that is). Eventually, the Arizona Cardinals ended his slide down the draft board in Round 3, and they believe that CB Patrick Peterson -- a former teammate of Mathieu's -- can serve as a mentor, helping Mathieu to keep himself on the straight and narrow as a pro. But, where exactly does the rookie fit in to the team's depth in 2013?