I still think with all Luffy has he would still lose to a fresh Kaido. Considering Kaido is the one on one king.
–- Update From New Post Merge ---
Glad the fight is FINALLY over. Kinda weird that in the end I only want for it to end no matter what the process is… and well, it was very meh. For a god fruit with an imagination-based power the finisher is very lacking in creativity imo. Literally the same finisher as Doffy, but only BIGGER. Also the coreography is just... not there.
As for the flashback, it was VERY lacking imo. Big Mom had that 2 awesome yet disturbing flashback, and Kaido is... again, just there. Very disjointed all over, interceded by yet FILLER pages and people running around. I think Oda is forced to insert Kaido's flashback but he had so little pages to plan... which is easily avoided IF ONLY he cut unnecessary filler pages.
At least it's over, so thank every deity above for it.
All this Haki power up, speed with G4, future sight just for "Big Punch go brrr". Albeit with Ryuo but still same thing.