I'm still going hard on my ZKK theory from december last year, and i was the first to say it.
Luffy will defeat Kaido, someone will be taken hostage and try to save Kaido from Luffy, Luffy will go to save the hostage, Kaido will try to hit Luffy and then Zoro will go and kill Kaido.
Just like Oden, but now with someone there to help Luffy, because Oden did all by himself.
and Just Like Zoro's introduction arc against Captain Morgans and Helmeppo.