Simons has only missed 3 games and Portland's 'average' offensive rating in those games was 106.7 when their season average is 107.3. Considering that Ayton also missed those 3 games I don't think Simons has had any significant positive impact on the team's offensive performance; at least not for the full season to this point. Playing 18 or 21 games is a decent sample size and Simons is 2nd on the team in average FGA, 1st in total FGA, and 2nd in usage rate with Sharpe. Blazers rank 27th in FG%; 24th in 3ptFG%; 28th in 2ptFG%; 29th in average assists; and 29th in average turnovers. Simons has been a big part of all of that
on the other hand, the average defensive rating of the Blazers in those 3 missed games for Simons was 106.2; their season average 114.7. No surprise but the gap is huge. In the 6 games since Simons has returned, their average d rating is 118.0
I agree with you that Ayton's defense is bad to mediocre. It always has been. He's not rim protector and he's mediocre as a paint defender. There also sure seems to be missing effort. IIRC, the high water mark for Portland's defensive rating was when they ranked 13th a two or three weeks ago. They rank 18th now.
in 2022-23 with Nurkic, Portland ranked 7th in the NBA in opponent FG% at the rim (0-3'); and 15th in opponent FG% in the 3-10'zone. The following season, with Ayton replacing Nurkic, Portland ranked 28th in opponent FG% at the rim; and 28th in opponent FG% in the 3-10'zone. Those are pretty extreme differentials. The Blazers rank 15th in opp FG% at the rim this season, and actually 1st in opponent FG% in the 3-10' zone. But anybody watching would likely conclude that's due to Clingan, Timelord, Camara, Avdija, and even Grant, rather than Ayton