This is a sign of Power's maturity and independence, IMO. An immature, dependent kid would answer "I'll do whatever the team wants me to do." The fact that he didn't answer like that would, if I were a GM, make me want him all the more because it suggests to me that he's the real deal. Certainly, there can be a problem if a prospect is too independent (see Fox and Vesey), but I think that it's more likely that he's simply signaling to teams that what he wants matters, too. The team that drafts him should respect that and not push him to sign immediately. He might change his mind and do that, anyways, but this is sort of a heads up that he doesn't want to be pushed too hard to change it. If you do that, he might resent it and it could lead to issues down the road. The best thing to do, IMO, would be to give the kid your full support in his decision to return to college, with the mutual understanding that he'll turn pro at the end of the season.
Now, the question is "will Buffalo be that accommodating?" We don't know. If they aren't willing to be, then they shouldn't draft him. That's sort of what Power is suggesting here, IMO, though not specifically to Buffalo, but to any team who might draft him. If Buffalo ignores it, thinking that he'll change his mind after they sweet talk and pressure him to sign, gets upset when he goes back to Michigan, then badgers him all season and repeats the routine next Summer, then, yeah, he might sour on them and start thinking of going the Fox/Vesey route. In that case, Buffalo would have no one to blame but themselves. Here's hoping that they're not that stupid and that they draft him only if they're willing to listen to what he wants to do.