I personally wouldn't make this trade.
Danny Granger hasn't been able to stay healthy at all the last couple years.
I'd rather see what Gerald can do.
All things equal, I'd take Wallace over Granger any day of the week.
NOW what I WOULD do is I would see if the Pacers would take Brandon Bass for a sign/trade of Tyler Hansborough.
Very confused why you wouldn't make this trade. Even if Granger never played a mintue for the Cs your shedding an aweful contract. This team is going no where with Wallace on it (even though I've been a long time Wallace fan) as for the rest of the deal bass may be a slightly better overall player but he makes 3 mill more for the same years and plays the same roll Sully and KO will play on this team. Indiana would never do it but from a Celts point of view I dnt see how you wouldn't love that deal. As for Physco T we just drafted our white PF for the future so no thanx.
You are thinking in terms of just dumping salary. I am thinking in terms of the quality of players.
I am not a Danny Granger fan. Never have been and never will be. Personally, I prefer players to you know, actually play

As for G-Wallace, I think he REALLY just needs Celtics fans to give him a chance. Before he got to that rinky-dinky Brooklyn operation, he was an exceptional player with Charlotte and Portland. Tough defensive player.
Now regarding your statement about having already drafted "our white PF for the future," I am really not sure what that means.
Usually, NBA teams have more than one power forward so if there's a limit on how many forwards a team can have, I am not aware of it. I like Hansborough because (like Wallace) is a tough defensive player who gets under the opposition's skin.
Others are looking at the Celtics from a standpoint of
"let's just see how we can gut this roster and save money" where I am judging it from the quality of the players we have.