No one's really mentioned this at all before but maybe the reason why Onaga is such a bitch is cuz he's not the true power. "The One" (entity? consciousness? I can't be sure) seems to be the real controller, through his subconscious will he has been controlling Onaga and Shao Kahn. His consciousness was split up into the seperate realms and if Onaga (According to his and others endings) had won he would have united the realms together bringing back the one, then he would absorb all entities, life and other things and become the one entity.
So is this the MK7 bad guy or what...