Like I said, hope I am wrong about the issue being at least partially systemic. Looking back at the Groce era though, well, hope I'm wrong.
If you look at your nicely put together list of leaders you will notice a lot of guards and a big that was never seen as a good rebounder. Egwu was a lot of things but a glass cleaner was not one. Thorne and Black are the first decent rebounders Groce has had so let's see what they do.