He is a very good defensive rebounder, but the thing is, the team has a bunch of good rebounders in Kidd, Butler, Marion, Dampier, Haywood, Najera, so the rebounding gets distributed evenly and takes away from individual rebounding. Plus, since he is often out on the perimeter, he doesn't get a lot of offensive rebounds. That's why his rebounding stat is never in double digits, because even though he gets as many or more defensive rebounds than a lot of elite rebounders, he doesnt get the added 3-4 offensive boards that they get, because their styles and systems allow that, Dirk's doesnt. But Dirk is a VERY underrated and VERY good rebounder. He times his rebounds better than almost anyone in the league, which makes up for his lack of ups.