I'll agree that Quinn doesn't time the snap as good as I'd like, but after watching tape on him, and not the youtube videos, sometimes that actually helps him. I notice a lot of the OT's anticipating a quick get off and they backpedal too deep too fast opening up the inside gap for Quinn to shoot. Also, it helps give him time to deduce if it's a run or pass. Very few people in this draft have Quinn's run/pass awareness. There is no doubt that Quinn has tremendous speed for a guy his size and his initial burst when he does move is incredible. But yes, he does need to time the snap better. I think switching from 4-3 DE to OLB in a 3-4 will actually help him do that.
That's what I see as well.
I remember when Suggs came out, many questioned his first step saying it was too slow. But he made up for it with his second step, which was the step he used to finish through whatever move he was using. Robert Quinn is similar; he also has this rare burst to finish a play once he's moving.
I agree with your assessment that his overall skill set will transfer well to OLB, which is why he's often times listed as a 3-4 OLB and not a traditional 4-3 end. Pittsburgh historically is drafting guys on day two (now day three) to play OLB. I can't remember a single one that played 3-4 OLB in college. Sure everyone of them had a transition period, but none were as talented coming out of college as Robert Quinn.
Chapel Hill has a number of prospects I like, including Marvin Austin and Greg Little, and that one safety. It's crazy that most of them were suspended last year; UNC might have been a National Championship contender if they didn't have so many suspensions.