I’m not sure the comparisons here are fair.
John A
15

Dude, Dirk is 7th alltime in defensive Rebounds (8th incl. ABA). With a very good chance to go into the Top5 next season. “Not a good Rebounder” may be an Understatement.

Of course he did not grab very much ORBs because he stretched the floor and so his overall Statistics suffered.