the thing is Kaido defeated Luffy 3 times on the rooftop, first Luffy run out of hacky juice, second ragnarock, third offpanel with the new PU after a fight that lasted maybe 10-15minutes, luffy was dropped in the ocean.
This fight, will not last long, as I said max 5 chapters of fighting + probably a flashback for Kaido (will not be that long).
Big Mom vs Kidd&Law is ....meh to be honest. I like a lot the 5SN but that fight is so meh so far, and Oda will not spend that much time for that fight, the worst that can happen is a totally offpanel fight for Big Mom&Kidd Law.
By the way if Kidd didnt unlock advcoc even after his awakening (like in the small panel that we have today) I dont think he will unlock this power.