Believe Luffy will beat major antagonist makes me 'Moe'. Man...Idk what I was thinking. Not like Luffy hasn't beating main antagonists several arcs....You must be reading into something that isn't One Piece to say that won't happen with Luffy beating Kaido.
Or it could be a Doflamingo fight 2.0 where Yamato plays the “Law role.” Meaning she helps Luffy at first and gets a lot of focus, maybe a flashback and then gets taken out leaving it to Luffy or something.
Overall Ulti perform great feats so far, endurance wise that was top from her.
Imagine if Ulti standing up after so many op attacks, just imagine how hard it going be to defeat the top flyers and overall the calamity.
I hope from now it getting better.