The 3rd ranked junior corner Kiper has him as?
Xavier Rhodes Florida State RS
DeMarcus Milliner Alabama
Nickell Robey USC
Darqueze Dennard Michigan State
David Amerson NC State
Tyrann Mathieu LSU
Kyle Fuller Virginia Tech
Could argue all of these guys are better than him in that junior class, especially the top three. But sure one might project Rhodes or Amerson as a safety and Mathieu clearly is not coming out this year.
As for Colvin, not quite sure he is a 1st round type of talent, improving yes but give me Tony Jefferson any day over Colvin as a defensive back regardless of position.