He might not have sky-high offensive potential, but I think it's not that far-fetched to expect him to become a great top-4 d-man, 20-30 points scorer, who's nasty, willing to drop the gloves, and willing to play to the limits of legality. He'll not have to worry a whole lot about playing with the puck anyway, Subban will be at his right taking care of that business.
All I want him to be is a psycho, nasty mother****er who plays great defense and who's a legit top-4 d-man, so he can act as a partner and as a bodyguard to Subban. And playing under Hunter, you can be sure the "psycho" and "nasty mother****er" aspects of his game are sure to be there... He just has to keep improving his defensive play and, if possible, learn how to fight properly this year in the OHL.