I really don't see McKelvin as a CB worth taking at #7-- I believe that a top-10 pick needs to become the cornerstone of their unit. No way, in my opinion, McKelvin becomes the cornerstone of the Pat's D. Impossible.
BUT
McKelvin as the cornerstone of the Pat's ST... well that's something I haven't really given much serious thought to. Would BB use #7 purely for a PR/KR? He just might. I know that Belichick is envious of the Bears for having a game changer like Hester. And if McKelvin is THAT kind of a STer... well, BB is a former ST coach after all. He look a flier on Bethel Johnson in the 2nd, mostly for ST and upside on O.
I know that many fans are thinking CB McKelvin as a possibility at #7. I don't think that's very likely. But KR/PR McKelvin at #7... well, maybe!