Every chapter from 1050 to 1053 makes it look like they're dead , i think
1050
- here's how Oda drew Kaido at first when he entered the Magma Chamber , bottom right frame :
https://mangasee123.com/read-online/One-Piece-chapter-1050-page-2.html
- and here's how he drew Kaido ( and BM ) later :
https://mangasee123.com/read-online/One-Piece-chapter-1050-page-11.html
notice the white things on their bodies , especially Kaido's left leg . it's as if Magma is tearing on them .
My point here is - i think it's very possible Magma was disintegrating them there .
- And then of course there was this extremely powerful eruption , which was the closest to Udon but it still looks far bigger than Onigashima ( so it dwarfed Onigashima ) :
https://mangasee123.com/read-online/One-Piece-chapter-1050-page-12.html
- And then Momo said that eruption signaled Kaido's
end :
https://mangasee123.com/read-online/One-Piece-chapter-1050-page-13.html
1051
- Momo said "Orochi's wicked rule and the threat of Kaido are
gone for good" :
https://mangasee123.com/read-online/One-Piece-chapter-1051-page-11.html
And well , we know Orochi is indeed gone for good , he is dead . So very possible Kaido is as well .
1052
- 7 days has passed , still no Kaido and BM in sight :
https://mangasee123.com/read-online/One-Piece-chapter-1052-page-6.html
1053
The new Emperors declared , still no Kaido & BM in sight
Now , i think it's possible we will see Big Mom in her ship next chapter , but i'm leaning towards her being dead since Kaido should be dead , especially since she has the same natural durability as him if not weaker .
Kaido also once said he wouldn't settle for anything other than Wano afterall , but of course his menace to the Wano citizens should cease by now .
Where did he say that ?