This has been my quest for a while. I will continue beating people over the head with this until they get it.
Rebounding numbers can be misleading as well. A team may outrebound its opponent but lose by a large margin. Why? If the opposition is making a high percentage of its shots, there are fewer defensive rebounds to grab. That is why Pomeroy calculates rebounding percentage as a more accurate gauge of a team’s rebounding ability. Arizona Coach Sean Miller values offensive rebounding percentage so much that he uses the statistic during timeouts and at halftime.
Wonder why he doesn't use defensive rebounding percentage?
Within a game, if a team has an offensive rebounding percentage of 40 percent, then the other team's defensive rebounding percentage is 60 percent. So basically you can use one or the other to get the same information. He probably just notes something to the effect that his team's offensive rebounding percentage is 40 percent and the other team's is 38 (in which case he'd probably be pleased with his offensive rebounding but not the defensive rebounding). A typical rebound is about twice as likely to go to the defense.