CB Syd'Quan Thompson might be a late round steal...
He had a bad hamstring at the Senior Bowl and couldn't really compete, couldn't run at the combine and then disappointed when he ran times in the 4.6-4.7 range at his pro day when he re-aggravated the hamstring.
I've seen the kid play a few games and he impressed me, he also had a 12.2 average as a kick returner, he plays a tough feisty game. I think he's built to play in the slot, one of those guys that's more football player than anything, if teams go off the film alone he would go very high in the draft but the times will turn teams off, I would throw a sixth rounder on him and steal him.
Another guy I like late is Trevard Lindley CB from Kentucky, he's long and lean and breaks up a ton of passes, reminds me of Sam Madison when he came out of Louisville running in the 4.6 range, he can also be a nice late round steal, or might go undrafted with the depth at CB this year.