TCU, curious about one thing. You mention that he has very loose hips. It does not look that way watching the videos and many of the experts on TV have said that he has tight hips. Did you misspeak or disagree with their assessments?
A little tight for a corner, but loose for a safety. It's relative and depends on the position you're evaluating him for.
Comparing him to Pitre, for example, he looks much better in transition.
Edit: I'll also add that while I don't know his shuttle and 3-cone times, some of that "stiffness" at corner could be a technique issue. The times where his transition really popped was him coming off of an assignment or triggering across the field to make a play in the run game. I saw him flip his hips and flat out GO.
That film, plus fact that he was still being ranked in the relatively high as a corner, tells me he has more than enough snap in his butt to get where he needs to be as a safety.