It could be something like this, the fights could be divided into two groups:
- 1st one, lead by Zoro with Yamato, Kid vs Kaido.
- 2nd one, lead by Sanji with Marco, Law vs Big Mom.
In case they both gets up, they will be very nerfed, tired and damaged so it could be possible that these groups can face them now.
Big Mom has still a lot of mysteries around her still hasn't resolved, like:
- Her Elbaph connections, Loki alliance business.
- Mother Carmel and all her stuff.
- Kid's stolen treasure.
- More Rocks lore?
While Kaido seems to be almost done for plot relevancy, unless:
- Oda give some more Rocks lore throught him.
- Kaido explain something more about Joy Boy, Wano Phoneglyph, World Government or his possible business associates (revealing them) like Doflamingo.