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Garnett is the first choice at center.
Let's say it again because it can't be stressed enough. When the Celtics moved Garnett to center last season after Wilcox went down and Jermaine O'Neal suffered his annual major injury, their season turned around.
Needless to say, Garnett will be back in the pivot this season in another example of it's it ain't broke, don't fix it. The position has evolved to the point that players like KG are the standard. There are far fewer old-fashioned, giant, low post only centers of any real import at this point than there are 5s like Kevin Garnett.
So pencil KG and shiny, new contract into the starting lineup. Then, insert Wilcox, provided he's all the way back from his heart condition that forced him to the sidelines last year. He'll be the primary backup.
Rookie first-rounder Fab Melo is more of a question mark headed into the season. There's no question that he's a project and when you add to that the fact that rookies, someone like Sullinger notwithstanding, don't play much on Rivers' teams (hello, JaJuan Johnson!), it's unlikely Melo will see too much run this year.
In fact, don't be surprised if journeyman/veteran Jason Collins is third on the center depth chart, at least to start the year. Collins won't be in the rotation either. But in dire situations, it's not difficult to see Rivers turning to him before Melo.
What's indisputable is KG's presence at the top of the list.