If the Terps get Prince, I'd stick him at backup LT for the time being. I see Prince and Gray competing for that position, while Mazyck competes with Doyle for the RT position. I'd like to see the team try to covert a few of these tackles to guards. If they don't do that, I can definitely see Mulrooney/Conaboy competing with Altamirano for the LG spot. This team needs a little more versatility with its incoming class at O-Line.
I think most lineman are in position where they need a year of adjustment to college before contributing... but I'm hoping a player of Prince's caliber can contribute right away if he commits. Maybe him and Gray at the tackles, and Doyle to LG?
Can see the scenario you posed being what happens though.