Really questionable decision. Nadeau had a fantastic freshman season, just about the best case scenario for him and Maine relative to expectations at the beginning of the year. But Bradly and his brother were less consistent in the second half without Breen in the middle, and Bradly in particular could have games where he struggled to create his own offence.
Granted, that's entirely understandably for a true freshman on the first line against strong Hockey East teams, and his overall game and compete came a long way throughout the year, but there's no question there was more to gain from a second year of college. It's hard to imagine the AHL as the best place right now for his multi-dimensional offensive game to continue to grow (and the Q should only be a last resort, given how big a step down it would be from HE).
Unless he is significantly closer to the NHL than he looked this year - and, in fairness, his year on year development trajectory has been quite steep, so maybe he takes a major jump - I don't really understand this unless Carolina actually believes he is best served continuing to develop away from his brother. Otherwise, it seems like an unnecessarily risky decision.