Tua is well beyond Barkley talent wise, but his medicals are going to be huge. Barkley didn't stay because of an injury, he stayed because he thought he could guide USC to a BCS title. Him getting exposed the following year was just what happened. Hindsight is always 20/20. Tua may need to do this to repair his draft stock. If he declares and his medicals come back suspect then the boat he's in will sink either way.