I think this is gonna end very ironic and tragic for Kaido. He clearly treasures his son a lot, yamato could be his kryptonite. Yamato's betrayal will hurt him the most above anything else. He'll finally understand Oden's feeling when he was desperately trying to save Momo (it was Higurashi) and threw the battle away. Maybe we'll see a moment similar to that in the final battle, where Kaido will be willing to throw everything away for his son.