Board Thread:Questions and Answers/@comment-4310945-20130627204343/@comment-26976025-20150922224159

Yhwach probably knows it is going to happen, but I believe his all seeing capability had it's limit before he absorbed the soul king. Knowing it is going to happen, but predicting when it is going to happen are two different things in the omnisensory capabilities. Yhwach knew what Ichibei could do, but until he performed the act all he was doing till then was over analyzing the situation until it fit the best point of action.