I pointed this out a few weeks ago when Walter had Steelers drafting ILB in the first. DL or TE would be in play as well. They could do with a really dominant NT, and depending on how they view Jesse James long term then they could be looking for Heath Millers successor.
Summary: Patrick Peterson is one of the top prospects to come along at the cornerback position in years. His size led some to believe he should move to safety. While he has that ability, he clearly has the speed to stay at corner - which he will. Like the legendary Deion Sanders, he can hurt the opponent on all four downs after showing what he can do on punt returns in his final season at LSU. As with many freak athletes, he needs to rely less on that ability and be more disciplined.