User blog comment:Xilinoc/Ch. 603 - What The Hell/@comment-2211792-20141029165838/@comment-6916556-20141030200603

I agree with Michael. I am fairly certain Yhwach isn't the big bad at this point. He will be the penultimate fight, possibly Uryu and Ichigo vs him. Then the Soul King will be the final fight. I think that will also bring Aizen and Urahara back into the story for a ten chapter finale.