I remember this was a common criticism -- how he'd steal rebounds from his teammates. I came across an interesting stat from the 2018-2019 season. It shows that OKC was far more efficient in transition when Russell got the defensive rebound.
Westbrook's defensive rebounding game supercharged OKC's transition offense. Makes sense. Can start the fastbreak much... faster. No need to waste time finding the ball first.According to Jeff Siegel, OKC is at 1.14 points per pos (PPP) when Russ grabs it and 0.96 when he doesn't.