I think whatever little success Granato found with this group... was less his ability as a coach, and more that we have some ridiculously talented players on this team that busted out (if you can call it that) once the Kreuger handcuffs were taken off.
Letting the kids play was a way to bring in some good vibes and make for some entertaining hockey for a few years, but it's not really coaching, and was always kinda doomed to crash into the wall once the league caught on and there were no adjustments to be made.
That said, he seems like a good guy and I think for a few years this group needed a players coach to shake off all the toxicity in the locker room. Wish him the best... but please, please find a coach that can hammer some real NHL structure into this group.