Comrie is filling the role Kevyn had Ullmark penciled in for. He's 4 years older than UPL, one year younger than Ullmark. This is what Kevyn wanted all along: A young, emerging goalie that can play a majority of games. I think the plan is to rotate goalies as the prospects develop and ride the hot hand from year to year.
If Comrie gets hot and UPL or Portillo or Levi is NHL ready, he can choose to pay Comrie as the long term guy and move one of the other goalies, or trade Comrie and ride the next one in line. Either way I think Kevyn's long term plan is to have enough goalie assets to have confidence that one will be peaking at any given point in time and "extra" goalies that are good but can't overtake the best goalie in the system can be moved for assets (just as FLA moved Levi for Reino, but possibly after he has a better look at the goalies before deciding which one to move).
The deep prospect pool in general is probably being built and developed with that in mind: Get the best players for your team (skim the cream off the top), know they're not all going to fit and move the leftovers for assets to plug holes. This is what Murray should have been doing once he had Eichel instead of trying to accelerate the build by acquiring good, but low character, players.