User blog comment:Kaido King of the Beasts/Chapter 800 Prediction/@comment-142.51.164.228-20150915151928/@comment-24769684-20150915195003

The thing is, we haven't seen Kaido enough to get conclusive evidence that he actually wants to die. I do not think he is incredibly serious about dying because if he was, he could have drowned himself (unless he can breathe underwater or some BS like that). Plus, he has an army of 500 Zoans, and their growth has only just halted. Usually, an army decreases your chances of dying. Maybe he wanted to see if he could die at Whitebeard's hand, who knows, but either way it would make sense that he would have a grudge on Shanks for stopping him. Kaido wants to "start the biggest war this world has ever seen" and usually a good way to make a war bigger is to have more combatants. Kid, Apoo, and Hawkins want to take down Shanks, and aren't ready to face a Yonko yet, so allying with Kaido makes a lot of sense. And the allied pirates aren't newbies, they're two year veterans of the New World who have very high bounties; I'd be surprised if the Yonko don't know who they are.

But ultimately, I feel Kaido's suicide attempts come from his love for excitement and determination to push the limits. He said he wanted to start a great war because he felt the world was too mundane, not because he wanted to die. There's a lot we don't know about Kaido, and my evaluation of him could be wrong, but this is my conclusion about Kaido based on analysis.