Board Thread:General Discussion/@comment-25360536-20141101201004/@comment-5551986-20141102141344

Ok, I don't want to but I'll be the first to give a truthful and MUCH, MUCH more realistic answer.

The Soul King is Yhwach's father, Yhwach takes the position as soul king during the time Ichigo and chums are occupied with his sternritter. Breaking the balance causing the worlds to collide, Ichigo and Uryu team up after Ryuken and Isshin die at Yhwachs hands and they win, letting shinigami, souls and humans live happily ever after. When Yhwach dies obviously there must be a spirit king, so Don Kanonji takes the helm.