This is all speculation on my part. I agree with the popular theory that Luffy defeats his opponents by killing their dreams rather than killing them. I think Kaido won't die in the battle and will be killed afterwards at the hands of CP0 because he's too inconveniently strong for the plot to remain alive, and it would also be a shameful death for him, which would mean his only dream of dying a glorious death is forever gone
I also think that Kaido will eventually overwhelm Luffy in their fight and then Luffy will be backed up by Zoro and maybe Sanji after they defeat King and Queen and the three of them will take down Kaido and leave him on the verge of death before CP0 comes, kill him and take his body away for Vegapunk to experiment on
I also think that Kaido will eventually overwhelm Luffy in their fight and then Luffy will be backed up by Zoro and maybe Sanji after they defeat King and Queen and the three of them will take down Kaido and leave him on the verge of death before CP0 comes, kill him and take his body away for Vegapunk to experiment on