Who said that? I can find articles as far back as last year suggesting that he'd be better suited at a non-QB position at the pro level: http://www.nfl.com/news/story/0ap30...ller-could-benefit-from-position-change-in-15 and his draft profile compares him to Denard Robinson, who is now a RB.
Cardale Jones, on the other hand, will absolutely be a first round pick - as he should be. I see Jones as comparable to Roethlisberger in a number of ways. JT Barrett is more of a wild card.