Green playing him over JBD and Matinpalo is a different argument than is it worth buying out his contract (which btw we probably couldn't do since he was getting work done on his knee which means he probably wasn't medically cleared and ineligible for a buyout anyways).
Buying him out meant about 730k in cap savings this year, which immediately gets eaten up by having to go out and find a different 7th Dman (who knows if they'd be any better), and then we're stuck with a 360k cap penalty next year.
I mean, would we really be better off having Matinpalo or Guenette up all year with JBD getting Hamonic's mins? Probably not tbh, at least not to any significant degree.