What if Big Mom and Kaido both survived the end of Wano? What role will the play in the story going forward?
Let’s start with Big Mom. If Big Mom survived i could see 2 paths for her story line:
1- She’ll be a major antagonist in Elbaf and there will be a major plot surrounding her and Gerd since they where once friends and either Big Mom will be defeated once and for all on Elbaf or she’ll help defend them from Shanks’ twin.
2- She’ll discover what the Blackbeard Pirates did on her island and attack Beehive in order to rescue Pudding, imagine if Garp and Big Mom were on Beehive at the same time, Blackbeard Pirates honestly may have gotten wiped out.
I think Kaido will become a very powerful ally of the Straw Hats for two reasons:
1- Kaido respects strength above all else and Luffy beat him, I can see Kaido helping Luffy in the final war even if its only a little.
2- Both Kaido and King had heard about Joy Boy before and even Kaido himself said it would probably take Joy Boy to defeat him, Kaido would much rather help Luffy than to see the World Government continue to rule the world.
*by Yoho