You guys are younger but I feel compelled to mention some old-timers. Obviously Alvin Adams was a great player and belongs in the top 3-4 but some other players were pretty good, too.
Garfield Heard averaged over 10 boards a game over his career, and played in the NBA for 11 years. Blake broke his single season mark of 21 double-doubles in a career he finished in 1970. Another player on that team that played in the NBA for 10 years was Clifford Ray.
Even a few years before them was the late 6'8" Don Sidle. He was a 2-time All American and was 1 of 3 Sooners to average over 20 points a game for his career (Wayman and Alvin were the other two). Sidle played in the old ABA. Another good guard was Willie Rogers.
Those 4 guys along with Adams were as good as the players over the past couple of decades. Especially Sidle and Heard who were only a notch below Adams.
The history lesson is over......