The goal is to develop him into a 2C.
Yes, he's played a QB role on the PP, mainly in juniors. I think he's more of a half-wall or a down-low guy, he's a puck distributor but he's got good hands to deflect and score quickly around the net as well.
Dvorak isn't here long term and will be the match-up center. I would expect season 1 with the Habs will be all about growing his offensive game, which means he will be the 3rd center, get an exploitation role with offensive players (think Dadonov and someone else) and be given a lot of powerplay time.