Doc will not want to come back. He realizes he burned his bridges here in a manner that makes some uncomfortable with his decisions and handling of his departure. No matter how much he says he loves the city, people will always doubt him and question his intentions.
Ray will NEVER EVER come back. Personally, I dont think the organization would welcome him back either. Yes he wanted to win a championship, but what he wanted he was security and we had that for him. We offered to make him 1/3 players with that clause in their contract. He felt betrayed beforehand and we felt betrayed after. That bridge is long gone.
KG is the only one I am up in the air about. He loves the Celtics but he also loves Doc. Would he rather retire in Min. or would he rather retire in Boston? Or will he retire with the Nets? If I didnt think Doc was as big an influence I would say Boston, but now I do not know. Regardless he will always be welcome here.
PP is a no brainer. He will comeback in one form or another, whether its a coach (its possible), one day player, front office guy (minor role), or even as a one year player. He will have his jersey in the rafters, no doubt.