defense: biggest need

The problem is there isn't a unit on our D that doesn't need a new starter. I tend to think our biggest defensive need is in the front seven, but I agree that our safeties are week (and our corners are mediocre to poor). Tyrann Mathieu would be small for an NFL corner, let alone a safety. No way he plays safety. His best bet is as a punt returner/nickle corner, and I don't see him as a Saint due to character issues. And I am a Tigers fan.