So, I exchanged the switch for a different one, same part number, same sequence. Same results. Mirrors fold, no front window power, rear windows function normally.
I checked out a co-worker's '07 Yukon Denali and the part number is different than the one I purchased from the Escalade.
I'll try sourcing a switch with that part number and see if my luck fares better. If not, off to the dealer to have the switch programmed.
I'll post up my findings on mirror index descriptions on my update..