Think about it. Kaido/BM already stated many will die if Kaido drops Onigashima on the Flower Capital. If Luffy wants to avoid senseless deaths, he has to stop Kaido before hand.
Oda loves recycling shit. First, he gathers Supernova vs. Main Villain. Then, Red Hawk -> Roc.

So how long will it take for Onigashima to Flower Capital? Will it take 1 hour this time?
Oda loves recycling shit. First, he gathers Supernova vs. Main Villain. Then, Red Hawk -> Roc.

So how long will it take for Onigashima to Flower Capital? Will it take 1 hour this time?