Dent is better than any of those guys. In terms of corners, I think the only prospects in the state I would take over Dent right now are Watkins and Payne.
I think he ran right around a 4.7 at the UA camp, he plays faster than that though. I'm sure he could get it down in the low 4.5s after getting to college.
You're talking about a legit corner who will play at 5-11, and probably somewhere in the range of 190-205 in college. I would take him in a heartbeat if he can show he's interested in playing ball somewhere.