I'm going off my board here a little and choosing Miro. (I'd previously had LaPierre here.)
I still have confidence that LaPierre turns into a regular NHL center, likely middle 6.
When I mentored young people at work I would preach that success usually doesn't follow a straight line. Improvements can be gradual, with occasional setbacks, and when you look at them at micro levels things can appear stagnant or negative. But stepping back and looking at a macro level, understanding that the negatives now are likely to be better than the positives 2 years ago is critical. Lappy may not be kicking ass and taking names in Hershey so far in his limited time there, but but he's still better than he was 2 years ago. His development curve in a lot of ways resembles McMichael's.
But the realization that Miro is almost exactly 2 years younger, having lost so much time from his cancer, and still - regular season only and small sample sizes caveat - has slightly higher PPG in the AHL, (0.61 vs 0.58) tilted the scales.
I hate comparing wingers to centers, for various reasons, but I think Miro has a slightly higher chance of being a solid top 6 contributor. (I'm intentionally excluding analysis of the Caps' current wingers, trying to look at him in a vacuum.)
I personally put a lot of weight on proximity to the NHL in these rankings. So while a guy like Protas may have a ridiculously high ceiling, it could still be >2 years before he is an NHL regular, and I think the guys above are closer.
Two votes for Lemay? Guess I need to watch him more. I think he must have a burner account on this board, looking at you kicksavedave.
(As an aside, I like how some said LaPierre "is 23", when he is 22 for another week and a half, but Miro "is 20" though he turns 21 in a week.)