nate33 wrote:Games may be played in minutes, but opportunities to get rebounds are proportional to possessions. Slower paced teams have fewer rebounding opportunities. That doesn't mean their players are worse rebounders....
Fair enough. & it's not just a matter of pace, since not every possession yields an opportunity to get a rebound. After all, there are no rebounds on made shots, so how well teams shoot matters too. For example, a team that shot 100% would get zero offensive rebounds -- because... it had zero offensive rebounding opportunities!

Other factors must figure in as well. E.g. the more a team fouls the more the opponent goes to the line, which would mean fewer defensive rebounding opportunities -- & fewer defensive rebounds.
In the end, however, the number of "rebounding opportunities" in a game must equal the number of total rebounds by both teams in that game. That is, if there was a rebound, there was a rebounding opportunity. & if there was a rebounding opportunity, then someone got a rebound -- except in rare circumstances we can safely ignore (e.g. someone had a rebounding opportunity, got his hands on the ball, but the ball slipped away & went out of bounds before he got possession).
This year, Pacers' games averaged a total of 88 rebounds by both teams. Wizards games averaged a total of 88.2 rebounds by both teams. I.e., there is a difference -- .2 more rebounding opportunities in a Pacers game. Make of it what you can!

nate33 wrote:And I'm not cherry-picking Turner's best year. I'm logically accounting for the fact that centers get more rebounds than forwards. When Turner plays center, he rebounds nearly as well as Bryant.
Well, first off, I don't think one can single out that year as "when Turner plays Center." It's true that as a rookie, with Mahinmi & Jordan Hill eating up most of the minutes at C, Turner spent more than half his time at the 4. He averaged 9.7 rebounds per 40 minutes. But, in his 2d year, he started at
Center & averaged 9.25 rebounds per 40 minutes.
His 3d year, the first with Sabonis on the team --> 9.08 boards per 40 minutes. His 4th year, the one you cite, his rebounding increased some --> 10 rebounds per 40 minutes -- his best results. Just like the preceding year, Sabonis is on the team. & he is again this year yet now Turner drops to his worst figure yet --> 8.92 boards/40 minutes.
I.e. He & Sabonis are both playing lots of minutes when Turner rebounds the most & when he rebounds the least.
Truth is, Turner has mostly played Center in his career. But even if 2018-19 had been the only year he played Center, so that we're only looking at his very best rebounding year, Bryant averaged 12.2 rebounds per 40 minutes -- 22% more than Turner's 10. So...
nate33 wrote:When Turner plays center, he rebounds nearly as well as Bryant.
...still doesn't hold up.
TBH, I think pretty often we (you, me, all of us) start by deciding who we think is good, who's better than whom, & only then do we try to make the numbers support that position. If there were no names attached, if it was just player A & player B, no one would be tempted to think that there was any ambiguity at all about who the better player is.
Then, looking away from the numbers, you'd have to consider factors that aren't captured there in a straightforward way. Spacing. Defense. No way they close the gap.