It seems to me that the Rebel OR1 level = standard OR2. And the Rebel Normal level = standard OR1. The Aero level seems to be right about standard Aero. It seems like they took the air shock system and programmed out the "normal" level, which is lower than preferred for normal driving on the Rebel.
If I'm understanding one of the other threads right, the linkage mod that pushes everything up another inch starts to put the shocks out of their sweet spot for ride management, and creates a really rough ride in OR1 mode, which is then 2" above "Rebel normal."
I'm guessing Ram engineers were already aware but were limited to working with existing suspension rather than making changes to it which would have to be recouped by sticker price. Reprogramming the computer slightly was a fair compromise if I'm understanding correctly.
It would be nice to be able to go up another inch or two, but that might have raised the cost of the truck another few thousand for every customer, and going up only that much wouldn't have satisfied the guys that want 3-6" lifts. I haven't noticed anyone talking about a 1 or 2" lift kit so far, everyone that's mentioned them is in the 3+ range. I don't think Ram could have satisfied every guy out there.