User blog comment:Fliu/Wano Country Arc Act 1 Thoughts/@comment-24287735-20181110032439/@comment-99.72.92.253-20181111170814

And if Kaido decided to investigate and found that Luffy's crew was not dead, then they certainly would be when he was done with them. This way he thinks that he has beaten the Strawhats and Luffy is locked up with Kid and other potential allies. Kaido will regret not killing Luffy when he had the chance.