How many times have we heard this? We need to get an "impact player" at CB in the 1st round. "We can't select so and so because he'd take longer to develop"....so on and so forth. But lets look at the current roster....
MM, Young, David, Gay, and Craft. Now lets assume said rookie CB, no matter who he is, can beat out Craft and make the 53 man roster. That would put him inactive on gamedays. Now lets say he beats out Young or David and is activated on gamedays and plays Dime back. Past that what rookie corner is going to come in and unseat Gay and MM as starters?
The point is, it sounds good to say "we need to get an immediate starter at CB"...but in reality regardless of who we pick, they will likely be the dime back or inactive their rookie year. So the moral is, pick the CB we think has the most potential and who is the best player available, not the CB whos most "NFL" ready but has a lower ceiling. Because that NFL readiness won't matter much anyway.
McKelvin or Cromartie have the most potential of all the CB's in this draft. The fact that they went to small schools and might need some coaching shouldn't be a factor b/c theres little chance any rookie corner is anything more then a dime back his rookie year anyway. Expecting any drafted corner to come in and start (on a team that has already signed a starter in FA no less) is unrealistic so don't base your grading of CB's on that.