I think maintaining some degree of control over the defensive glass is crucial for the Spurs, particularly early in the series. As the Cavs send their bigs to the offensive boards, the Spurs can get transition opportunities with numbers by simply being strong on the defensive glass and pushing the ball after the rebound, particularly when Ilgauskas is on the floor. I can't see that Z has the speed to get up and down with Duncan, Oberto, and/or Elson. It seems to me that if the Spurs can control the defensive glass early in the series, it puts the Cavs in a predicament about whether to continue to crash the boards and give up break opportunities or to focus on getting back in transition and foregoing their usual feast of 2nd chance points. Even if the affect on the Cavs' decision-making isn't that pronounced, controlling the defensive glass with gang rebounding will aid the Spurs significantly.