Answer (1 of 2): A clash between yonkou would make headlines all over the world, even in a isolated country like wano. If it's the weakened big mom we have right now kaidou should be able to defeat her a lot easier then if she was at full power obviously, and wano wouldn't be in shambles by time
One Piece: Every Fight In Wano
What would happen if Kaido and Big Mom fought and invaded the My Hero Academia verse? Could anyone from MHA stop the two? - Quora
How can Luffy win in the Wano arc when it is impossible for him to beat two Yonkos at the same time? - Quora, luffy png wano
Who would win, only Kaido and Big Mom (no crew) or Shanks and his
Yonko - News - IMDb
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One Piece: Big Mom Vs Kaido - Who Is The Strongest Yonko?
Wano Country Arc, One Piece Wiki
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If Kaido and Big Mom fought in Wano, who would win and what would happen after? - Quora