Everybody here seems to be already accepting Momo killing Kaido? Even the Zoro fans are going back to trashing Oda once more. No surprise there tbh.
It isn't over till the fat lady sings and remember Oda has a tendency to subvert our expectations. This whole Momotaro theory may just fall apart and something different might happen. He knows most people are aware of the fairytale and he may change certain aspects of it to make it his own. ZKK might still happen.
Not saying I want it to happen but I wouldn't put it past Oda to do just that. I would wait till the end before claiming victory over something as if it's already happened.