Let me say that I believe that Bill Parcells is the BEST evaluator of Defensive Linemen ever. If you look at his Big Board from the ESPN show Bill Parcells' Draft Confidential, you'll see that he has Quintin Coples as top D Lineman in the draft and a top 10 pick and way ahead of any other D-Linemen. He had Upshaw, Ingram and Mercilus, in that order, in the bottom half of the first round. Take a look:
http://www.youtube.com/watch?feature=player_embedded&v=xhduF7n8Oa0

P.S. Change quality to 720P in settings and FF to 1:01 to get a good look at the board.