7.8ppg, 1.4 apg, 1.2 rpg on 42/43/80 splits
2022 Stats (Overall):
16.4 ppg, 3.8 apg, 2.7 rpg on 44/40/88 splits
2022 Stats without Lillard:
22.9 ppg, 6.1 apg, 2.9 rpg on 46/41/84 splits
If he averages exactly his current post-Lillard production, he will end up with ~19ppg/5apg/2.8rpg
He will have increased his PPG by 11.2, APG by 3.6, and RPG by 1.6 while becoming more efficient from the field.
Looking at recent historical MIP winners, none of them had jumps that big.
https://theanalyst.com/na/2021/10/nba-most-improved-and-breakout-player-candidates-in-2021-22/
Improvement comes in many forms, but this is a scoring award. Those winners from the past 22 seasons averaged 12.33 points in the season prior to being named MIP, then 19.97 in the year they won – an average increase of 7.64 points.
I'm asking this as a guy who picked him up at +8000 and +7000 odds and recently started digging into the history of the award, and taking into account Simons is now the #1 option on the Blazers, I think he's got a good shot at finishing around 20ppg.