I don't follow CFB much and I'm not much of a draftnik but I saw that interview on NFL network with Rosen yesterday and he sounds like an idiot.
He's only 21 and I'm always hesitant to handicap guys careers based on their personalities, but his demeanor is nowhere close to that of the modern elite QB's. He sounds more like a loquacious receiver or corner. At those positions, I think having that type of swagger can be good but QB your really part coach/part player and it just takes such a more steady player.
Definitely is gonna need to grow up a bit.