Oh don't get me wrong, I'm not saying they aren't talented. I'd be thrilled if Dallas got DRC at #22. We're in a situation where we wouldn't need him to come in and be the #1 or #2 guy right away though. However, the jump from Tennessee St to the NFL is much bigger than the jump from a Div 1A school to the NFL. If a team needs a #1 CB then picking a small school player is a huge risk, they just aren't as likely to be able to jump right into the mix of things and succeed against the T.O.s of the NFL.
It's so important to hit on first round picks that teams often take "safe" players over those who have higher potential. It's like theogt mentioned in another thread, with first round picks you often have to draft the player with the lowest "downside" as opposed to the highest upside. When teams draft small school prospects or conversion prospects they're taking a much bigger gamble. Yes it does work out sometimes, like with Ware, but that's more the exception than the rule.
Like I said, I just don't see three teams all willing to take those risks before 22. But sure, it might happen, and where does that leave us? It leaves us with the CBs who preformed at a higher level against better competition, like Cason and Talib.