rebounding for the Blazers is actually kind of scary. If you assume that the starters will be Scoot-Ant-Thybulle-Grant-Ayton, and then add them up by their career rebound rate (giving Scoot a huge benefit of the doubt);
Scoot 7.0%
Ant 5.1% (4.3% last season)
Thybulle 5.4%
Grant 8.1% (7.2% last season)
Ayton 18.8%
that would mean, optimistically, assuming the starter grab somewhere around their average, that the Blazer starters would lose the rebounding battle 56%-44%
and that really illustrates that it's important for all players to rebound well. For instance, it you replaced Ant with last year's Brogdon (8.8%) and Thybulle with last year's Josh Hart 14.1%, the 56-44 disadvantage flips to a 57-43 advantage. Obviously Hart is something of an outlier as a rebounder, but the 10.5% combined rebounding of Ant/Thybulle might be the weakest rebound pairing in the league at the wing positions. Denver's starting wings were at 16%; Golden State's were 15.5% which is weak but Draymond is much better than Grant; LAC's were 18.8%; Kings were 18.8%. Utah wings were insane at rebounding with 31.2% and that's one big reason they surprised so many people
I have no doubt at all if the Blazers start Ant-Thybulle-Grant that will be the worst rebounding trio in the league at SG-SF-PF