Kyoshiro is a member of cp0 that was sent by the samurai gorosei to plot a rebellion against Kaido, while Luffy's alliance and their plan to take down Kaido is happening.
Kyoshiro will lay out baits and will speed up the process of the upcoming war so the world government can step in and attack once both parties are weak.
Kaido will figure out Kyoshiro's true identity and will team up with Big Mom and take down the alliance, re activate the Rocks Pirates and start the war with the World Government.
Luffy's greates power up will be against Big Mom. it will be 1v1 and Luffy will master gear 4 and improve all his Haki Skills.
Simultaneously, the alliance will face the Beast Pirates, Strawhat Grandfleet with the Sun Pirates will face the Big Mom pirates outside wano.
this will be broadcasted globally by some cp0 agents in wano.
The countries that luffy helped will send their army together with the remaining Whitebeard Pirates vs The Marines led by Akainu will fight outside Wano as well. It will be a war on water.
Luffy will def hit the final blow against Kaido and will win, while Kid will take down Akainu. All while being attacked by Buster Call that was triggered, and is happening at Onigashima.
After the war, Onigashima will be erased from the Map.