User blog comment:Kaido King of the Beasts/This Isn't Even My Final Form!-When Powerups Go Wrong/@comment-5398287-20151107180432/@comment-5398287-20151107220109

True, but remember that he was about to lose to Shunsui with only that going for him. If Yhwach is (hypothetically) only going to be defeated by Ichigo, who at this point is like a Super Shinigami God Super Shinigami among other Shinigami, it stands to reason that his personally hand-chosen elites can only be defeated by 1. uber-powerful and overwhelming badass above-captain level Shinigami like Nimaiya, 2. science, or 3. multiple Shinigami taking them on at once, which is what the end of 650 seems to be setting up.