The zone limits defensive rebounds, but remember that last season Lydon was the only center, since Coleman was not allowed to play more than a handful of minutes, and absolutely positively could not foul out of the game. He could not fight hard for boards.
If Boeheim tries the same strategy this season (e.g., that they will only have so many possessions and he wants his best offense on the floor) they'll lose the rebound battle again. I don't know, Coleman looks good to me on offense if they just let him take some 8-12 footers & get fouled - he can be a decent FT shooter with some floor time.
Center has been such a messed up position at Syracuse for so long. By the time SU gets a guy who can play the position, he's only here that season, and then it's usually three seasons of W T until the next one figures it out. Chukwu looks like he needs to just calm down, try not to do too much, and protect the rim. From what I've seen he's often trying for blocks well out of position.