No, but I do believe 3 published and professional sources. Have you seen extensive game footage on DRC? If you haven't seen tapes of him playing all four years of college then you really haven't.
"As far as "When I hear "good athlete but not a football player", I think of guys like Tom Knight who had great measurables but never produced on the field. Rogers-Cromartie has produced on the field."
This is where you and I get crossed up. When I say that someone is a football player, I am saying that he plays a physical style that translates to the NFL. A football player is a strong tackler, has good strength at point of attack for his position, and can hold up against the offensive player he is matched up to. Cromartie struggles in these areas. He is not strong in body compared to others at his position nor does he show the physical makeup to handle larger receivers or bring down NFL runningbacks. DRC has all the physical tools of an athlete (speed, agility, acceleration) but, at this time, very few of the tools that comprise a football player (toughness, strength, agression). It doesn't mean that he can't develop them, but that takes time.
As far as never seeing him play other than at the senior bowl, you are right, I haven't. Have you? For someone who is challenging my certainty about DRC, I haven't heard any prevailing evidence otherwise. This is why I read and compare the analysis of multiple sources before I interject an opinion in these matters. I like DRC and think that he will be a very good pro but I think that out of the 16 best college players in the country that there are better alternatives for us to help this team. If we could trade down and take in the later 20's or early 2nd round, he would be at the top of my list.