I honestly didn't even go that deep into connecting the dots between the different motor configurations, but your analysis makes sense.
Now that I'm looking into this, looks like the 3 motors are have the following HP:
1. 221HP
2. 168 HP
3. 117HP
From one of the vanilla Subaru Getaway videos I watched last night, a reviewer mentioned the car is powered by 2 221HP motors found in the fwd Highlander. The review also mentions the HP numbers from the 2 motors aren't always additive, which explains why the Getaway only has 420HP instead of 442HP.
The RZ450e is an anomoly - the powertrain is a carry-over from previous years which means the updated motor configs won't line up.
If the platform supports these various configurations, it makes me wish for an Uncharted Wilderness STI with 2 large motors. Think that thing would make a proper Rallycross rig.
So....when are you picking up your Uncharted / C-HR to join the Lezbaru family?