You may question whether he's eligible as a "breakout player," but my pick is Cromartie. He had 10 picks in half a season as a starter last year. Imagine what his numbers could be with that experience and now a full season as starter. Wow! This guy will breakout from his breakout season!
Jay Cutler. If he can put up #s like he did last year, while unexplainably losing 35 pounds and being sick and tired all the time, imagine what he could do when healthy, and entering his 3rd year as the starter.