I don't think he's all that fast...
He is expected to post a blazing 40. He has been reported in the mid 4.3s with a 40+ inch verticle. That is an extraordinarily explosive athlete. He's 230+, a true freak. Moreso than any of the WRs he's being compared too. We'll see if these numbers hold up at the Combine, and I have my doubts too, but those who follow him closely have been reporting these numbers for a couple years now. He may lack some quicks, gathers at his breaks. He may be too dependent on jump ball skills. I thought Eric Weddle got in his head, had Calvin looking for him, and Calvin dropped a few with alligator arms as a sophomore in that bowl game. Extremely quick small DBs like Tye Hill have done well against him, but you have to think Calvin will win those battles in the redzone. He may not be as physical as he should be. He's like a 2 year old Great Dane. He doesn't know what he is yet, but watch out when he figures it all out.
Keyshawn as his downside is really setting the bar low, and Keyshawn hasn't been that bad. I don't have an early dynasty rookie pick, and though I would love any of the top three, I'm kind of happy I don't have to trouble my head figuring out who is the best pick.
ETA pt 2. If all that sounds a little too negative, I would compare Calvin more to Randy Moss than Larry Fitzgerald. A bigger Randy Moss with very high character. Thus, I agree with Who Dat's "as close to a can't miss" as possible.