User blog comment:Godisme/Deicide...Ah I can't keep track anymore/@comment-1906999-20100710234648

I think that Spirit King would have to have some sort of power in the position itself. If it doesn't, and it's just a title, then Aizen wouldn't have a reason for going after it. It'd be pointless for him to become Spirit King if he doesn't get anymore power from it, considering his almost god-like status now. Besides, what would stop the Royal Guard from coming in by surprise and killing him at any moment?

Political power is a possibility, but again, everyone has the option of just not obeying him. He could threaten to kill them, yes, but that would just give more incentive to rebel.

@Blaze - That is possible, but he could work his entire lifetime towards it, and then simply not be chosen. We don't know exactly how you get in. Even if he did, we don't know if he would even get close enough to the king to kill him. To just sum it all up, we really have minimal info to base any theories on, so in all likelyhood, we're ALL way off.