Now let me just preface this by saying I believe they are 100% dead and will not be coming back.....but what if im wrong? What if big mom and Kaido both survived the end of Wano what role will the play in the story going forward?
Big Mom- Let's start with big mom i believe if Big mom survived i could see 2 paths for her story line,
Path A- 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 Nega-Shanks and they'll forgive him
Path B- 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 was on Beehive at the same time, black beard pirates honestly may have gotten wiped out
Kaido- I think Kaido will become a very powerful ally of the strawhats 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 and Secondly both Kaido and King had heard about Joyboy before and even Kaido himself said it would probably take Joyboy to defeat him, Kaido would much rather help Luffy than to see the world government continue to rule the world
Big Mom- Let's start with big mom i believe if Big mom survived i could see 2 paths for her story line,
Path A- 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 Nega-Shanks and they'll forgive him
Path B- 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 was on Beehive at the same time, black beard pirates honestly may have gotten wiped out
Kaido- I think Kaido will become a very powerful ally of the strawhats 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 and Secondly both Kaido and King had heard about Joyboy before and even Kaido himself said it would probably take Joyboy to defeat him, Kaido would much rather help Luffy than to see the world government continue to rule the world