Millhaus is far from the only one to question Bowey's toolbox. That has been a frequent concern among people who watched Bowey in the WHL. He has typically struggled whenever he moves up to a higher level of competition. If you dig up old threads about the Memorial Cup playoffs, WJHC, or rookie tournaments he played in, you'll see some of that sentiment there. It's part of the reason Mann took it slow with Bowey last year, playing him in reduced minutes, giving him nights off, and not overwhelming him with powerplay duty so he could focus on simplifying his game.
The hope here is that his time spend in a pro system in Hershey has helped Bowey grow into a more complete player who can execute at NHL speed. They were very deliberate in how they played him last year, with the hope of doing just that. I think it's likely that Bowey starts in Hershey at the very least, and gets to play a bigger role there than he did last year.