Former New York Knicks point guard Stephon Marbury has signed with the Boston Celtics.

Although Marbury was a starter pretty much his entire career and is capable of putting up 20 points and tossing around eight assists over the course of a full game, the Celtics already have championship-level chemistry, and having Rajon Rondo run things is working out just fine. So they’re not changing that.

It’s expected that Marbury will be used as a prime scoring option off the bench, alongside Eddie House.

But the Celtics win with defense and teamwork, so they’re not looking to have Marbury merely put the ball in the hoop a few times. He’ll be expected to defend as hard as he’s ever done in his life. And move the ball properly.

If he dominates the rock more than the team wants him to, or lets his man go by him too consistently, or doesn’t grasp their team defense schemes, coach Doc Rivers won’t hesitate to sit Marbury down.

If a problem develops, they’ll get rid of him immediately.

It’ll be interesting to watch, but I think in limited minute and a clear backup role and his head on straight, Marbury makes the Celtics better.

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