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The Celtics have four centers and three power forwards on their roster. By any team's standards, that's a lot of size.
They need it too because their main competitors in the Eastern Conference are the Miami Heat (a team who's only discernible weakness is their lack of size) and the Orlando Magic (who have Dwight Howard). There's also the Los Angeles Lakers to consider, who have probably the best 4-5 duo in the NBA with Pau Gasol and Andrew Bynum (and Lamar Odom coming off the bench).
If Wallace were to return he would be, at best, third on the depth chart at either center or power forward, wherever Doc Rivers prefers to use him.
There hardly seems enough minutes to go around for the players that are in Boston right now, let alone enough minutes to accommodate a 36-year-old veteran like Wallace.
But the caveat here is that the big men the Celtics are relying on to carry them to an NBA championship are, well, not reliable.
Both O'Neals are huge injury risks. Perkins is trying to return form an injury that sometimes takes two seasons to fully recover from and he has a history of other injuries, most notably with his shoulder. Garnett hasn't been healthy for an entire season since 2008.
Glen Davis is a role player at best and the two rookies aren't ready for playoff action just yet.
If the Celtics go into the playoffs with all seven big men healthy then it makes little sense to bring in Wallace to disrupt the rotation and team chemistry. But the chances of that happening are roughly zero.
If Rasheed Wallace truly wants to return to the Celtics for one final run, then Doc Rivers will find a place for him. There aren't more than a handful of players in the league who can actually defend Wallace on offense, and if he's committed to playing defense then he can be a serious force on that end as well.
In baseball you can never have enough pitching. In basketball you can never have enough big men.
Wallace is coming back and the Celtics couldn't be happier.