I did a little check a few weeks ago on what a league average rebounding team would average for Dreb% Oreb% based on shot locations allowed/shot location and the Celtics are doing a bit better than average in both categories.
Their Dreb% on field goals is about 0.8% higher than an average team based on shot location allowed (10th best differential), and 0.7% (14th best differential) higher than an average team based on shot location.
Edit: This obviously isn't super relevant to the bottom line. It just highlights that part of rebounding is tied to shot diet/shot diet of opponents (and to some extent, blocks/blocks against frequency.)
Their Dreb% on field goals is about 0.8% higher than an average team based on shot location allowed (10th best differential), and 0.7% (14th best differential) higher than an average team based on shot location.
Edit: This obviously isn't super relevant to the bottom line. It just highlights that part of rebounding is tied to shot diet/shot diet of opponents (and to some extent, blocks/blocks against frequency.)