With Momo, I just don't see him being able to wound Kaido. He's Tom Hanks, his body is 20 years older, but his mind is still 8, or whatever age he is? Doesn't he need to be able to use Ryo Haki to even lay a scratch on Kaido , let alone injure him? The only way Momo has a hand in defeating Kaido, is commanding Zunesha to attack him.
And again, really how else would Luffy defeat Kaido, other than a punch? Punching is what Luffy does. Luffy beats him with a kick? Is that a big difference? I took Oda's words as a normal punch defeating Kaido, which is not what happened.
I could see Kaido maybe not being defeated yet? But Luffy technically not getting the W, the first time he uses Gear 5, would feel very strange.
And to be completely honest, I'm just ready for this Arc to be over, as much as I've liked it. I'm ready for the next part of the story. Because for the first time in a long time, we don't have much of an idea where the Straw Hats are going next? They need to find that last Road Poneglyph, but we don't even know where it is?