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You want to know why I gave the Celtics a full "A" for interior defense? Because they signed Jason Collins.
Yes, Boston already has Garnett, arguably the best defender in the game, period, but Collins is one of the league's best low-post defenders. Former Orlando Magic coach Stan Van Gundy once stated that Collins defended Dwight Howard better than anyone in the NBA, and that is obviously humongous praise.
The C's signed Collins for one thing: to defend the likes of Howard, Andrew Bynum and Marc Gasol. Now, K.G. doesn't have to tire himself out by banging with those bigs in the post. He has Collins to help him there.
First-round draft pick Fab Melo could definitely become a big part of the Celtics' interior defense also, as he stands seven feet tall, weighs 255 lbs and has good shot-blocking prowess.
Still, it will take some time to integrate him into the defensive scheme, especially considering he played Jim Boeheim's zone defense at Syracuse.
As far as the rest of Boston's big men go, Wilcox is decent, as he has size and length, but he is far from intimidating down low.
Sullinger just doesn't have the physical tools to ever be much more than a Glen Davis-type defender.
No matter, though. As long as Garnett and Collins are up to task, the C's won't need much else down there.