dougie diesel, you're a bit hard dude, don't assume that he's or not a b1/b2.
simple questions need simple answers, my answer would be "why would you just power the ground handling bus and nothing else with apu power, something wrong dude???"
and is is it possible to run #2 eng on the md11 without elec power(not starting)?, yes it is, if idg 2, apu and ext power craps out, and it's weird having a bat powered cockpit and hearing #2 running