Amid all the talk about Maggette and Posey and Andersen and all the other free agents, there hasn't been a lot of mention of some other very important free agents, the Celtics assistant coaches. All 4 of Doc's assistants' contracts expired on July 1, making them all free agents. Doc has one more season on his contract and Danny has begun negotiations to give Doc an extension. More important, though, should be signing their assistants to new contracts before another team lures t...