If you want to get into the "sabermetric" side of things, Redd is still very valuable and much better than people give him credit for. The four factors (in order of importance) to winning a game are: 1) shooting well 2) Taking care of the ball (in other words, don't turn the ball over) 3) offensive rebounding 4) getting to the foul ine Redd does 1, 2, and 4 very well. Given his position it's not surprising that he doesn't get all that many rebounds.