We have a 22 man NHL roster. When RHP comes back, he either goes down or Condotta goes down. We stay at 22.
Bring up Connor Hughes to play the next two games that Monty sits out. Dobes can play two in a row if he has to. If Hughes plays well, waive Primeau.
Hughes is doing incredibly well in Laval, and Dobes was hurt for little bit, which is why Hughes played more.
I'd wait until we have more clarity as to how Dobes is health-wise before making any moves to call-up Huhges.
If we start to turn a corner in the next 5-7 games and Dobes' health holds up, then maybe we could do as you've said.
Not only that, but if Primeau continues to suck, I would actually get him to go through waivers and send him down to back Dobes while calling-up Hughes.