He was "good" at this year's development camp. Which isn't a defense of Thompson in the NHL, just noting that he didn't suck and actually scored goals with his goofy ways. He still displayed what I would consider deficiencies when in the offensive zone, especially when he had possession.
My conclusion on Cozens, then, is that he needs a few years development time, at least, and we should in no way expect him near the Sabres for at least two seasons, if not more. I know, shock analysis. I want to see his offensive zone game way better than it is, for a first round pick. And if Thompson is his equal today (or should I say today), keep Cozens the hell away from the NHL and develop that boy correctly.