Take an even closer look - he's the same Man. He was too awesome even for Hell, so we got to resurrect him by sacrificing our good units in droves)
Geh, my guess was he'd get possessed by some sort of Demon God and we'd have to fight through White Empire to kill him and obtain his kool sword as second Awacening title for Prince, what gives his skill)
Making their territories next set of storyline maps and stage of some events would not be that much unexpected development. And from translations it seems Empire is very antagonistic to us, so it is unlikely they would willingly join forces with Prince, let alone come under our command (with exception of female officers our Raise Morale seduced already ) I wonder, what would happen there...
ЗЫ. Dark Knight Commander is da Man. And with SAW he becomes physical version of SAW Sybilla, with ridiculous power behind every blow...