I move the guy who struggles in the playoffs when it gets more physical vs the guy who is bigger and more playoff ready. Ideally it's Smith or Reilly but Gryz nets a return without adding and is replaceable.
Playoff ready against who?
Carolina, New Jersey, Toronto, Florida, Pittsburgh, Rangers... there are a lot of "speed and skill" teams in the East this year that I think having Forbort and Carlo in your lineup at the same time would actually be a detriment in playing against. If you are playing the Islanders Forbort might be nice I guess?
The elephant in the room is obviously Tampa, who, like Boston, has the guys in their forward group to play a more grinding physical forecheck heavy game, but there are a LOT of playoff matchups where Gryz's deficiencies are a non-issue.