Yeah - that would be ideal if cozens can prove he's ready (please? I don't think buffalo is going to be able to pull 2 middle 6 centers in FA). That'd leave VO-???-Mojo on line 2, and ???-Lazar-Okposo on line 4.
Not sure Mitts can do much here. He may need to learn to play wing in rochester because he's just been a failure at center. Can't drive the puck, can't play defense, no physicality, terrible on faceoffs, doesn't get to dirty areas, doesn't play well without the puck. He's literally dragged down whichever line he's played for the last 2 years. Same with Thompson - one of these guys has got to figure it out and stick in buffalo next year.
Moving Mitts/Risto/both could help fill one of those holes possibly, but that's dependent on what they feel from their depth on defense. I'd also be open to bringing in a couple of prospects in a deal like that since the pipeline isn't great. It doesn't help buffalo today, but filling the 2C hole doesn't get buffalo to a cup. The plan should be to build a perennial cup contender, not spend a bunch of money/trade the only assets you have to try and slip into the playoffs.