User blog comment:Xilinoc/Ch. 661 - MY LAST WORDS/@comment-24769684-20160204143637/@comment-11051098-20160205184739

That could explain why Yhwach appeared surprised when Yoruichi appeared and set up that razor wire stuff around him after he stabbed the Soul King. Perhaps the future he chose to see as the most possible, didn't include her showing up or something.