This is super interesting and useful. Thank you for sharing.
First, of course, it is a well executed approximation. That matters, though it seems like a good statistical guess.
Second, and this may just be me, the links to Chamberlain and Russell don't have Total Rebound %. It's broken down to defensive and offensive rebound %. (Is it just an average?)
Third, Wilt was 30 in the 1966-67 season. After that both his offensive and defensive rebounding percentage declined every single season; Russell was 29-30 when he began his (more fitful) decline. Wilt retired at 37; Russell at 35. There were clear declines before that. Further, almost all the best seasons outside of Rodman (a 6'7" rebound freak/savant) happened when players were relatively young.
Aside from Drummond and Rodman, the Top 25 seasons (Basketball Reference) all time have been done by DeAndre Jordan (turned 30 over the summer), Reggie Evans (done when he was 24 and then again at 32), Marcus Camby (done at 36, which is an outlier), Hassan Whitehead (27), Jayson Williams (27), Danny Fortson (22), Enes Kanter (25), Kevin Love (22), Dwight Howard (31), Moses Malone (21), Ben Wallace (28).
I mean, a few things jump out at me. First, most of the best total rebound% are from younger folks (again, I'm using official stats, and didn't convert the WhatIfSports to Total Rebound %). Almost none of these names, other than Moses, jump out as a true great player. Peak Love and Howard are very good. I know Rodman is a HOF, but I just don't consider him among the Top 10 (at least) PF. Love is a borderline HOF. Jordan is fringe. Howard may make it in there, but he isn't even Top 15 centers of all time. The list doesn't do anything for me in the way that some other advanced statistics do.
Anyway, I love your posts, and I love Dre, but the he's made NBA Third Team once and will be hard pressed to make it again. Happy to be wrong here, but I'm just not convinced.