Oh, I agree, I'm speaking from the position of "every single person in the bullpen is in a key role" because the bullpen needs so many quality arms going into next season.
I don't expect Moran to step into the eighth inning on Opening Day but given how shaky the bullpen has been this season, how few reliable arms are returning, and how many injuries we've seen in pitching, he could easily be thrust into a more important role within a few weeks of Opening Day.
In my eyes, pretty much everyone who isn't literally the last guy in the pen is a key pitcher for 2022.