Remember there was an Eruption just after the war ended , so i'm not sure he and BM are still in the Lava/Magma Chamber
- Also here was how Oda drew Kaido when he first entered the Lava Chamber : https://mangasee123.com/read-online/One-Piece-chapter-1050-page-2.html
Looks like his body was intact , or 98 % intact .
- but here was how he drew him in page 11 :
Notice these white things on the drawing of his body , especially his left leg ( Big Mom have some too ) , to me it looks like they could be meant to show Magma was tearing/disintegrating them there
- And then of course there was this extremely powerful eruption : https://mangasee123.com/read-online/One-Piece-chapter-1050-page-12.html
My point - i'm not sure their bodies still exist , that Eruption could've erased their bodies completely . And if their bodies do still exist , i'm not sure if their bodies are still intact ( because the Magma maybe was tearing/disintegrating them in page 11 1050 )
Maybe they're not in the Lava/Magma Chamber either ( maybe the Eruption threw them out assuming their body survived the Eruption even if they were not intact ) . Anyway 7 days has passed since 1052 but they have not showed up .
I think Kaido should be dead though , he once said he wouldn't settle for anywhere else other than Wano : https://mangasee123.com/read-online/One-Piece-chapter-1016-page-14.html
But of course the threat from him to Wano should cease now , and well Momo did say "Kaido was ended" and "the threat of Kaido are gone for good" : https://mangasee123.com/read-online/One-Piece-chapter-1050-page-13.html
And if he's dead , it's only logical that BM should also be dead IMO .
- Also there was this talk between Peros and Daifuku on who would be the Captain of BMP if BM died : https://mangasee123.com/read-online/One-Piece-chapter-934-page-3.html
Maybe just maybe a foreshadowing from Oda that BMP would have a New Captain , maybe they'll even ally with Luffy under Katakuri .
I think it's possible though she'll show up next chapter on her ship , but i'm leaning towards her being dead because since Kaido should be dead , logically she should be as well .