Oda made a big deal out of Kaido's desire to face death and his belief that in death a man perfects himself.
However, we also know that Kaido could not be killed by any means, so he has actually never felt what it's like to be on the brink of death.
This arc is inspired by the story of Momotaro, a young boy who goes to the Island of Onigashima northeast of Japan, where a band of "Devils" who terrorize the country have located their stronghold. He makes friends with a Monkey, a Dog and a Pheasant, and they manage to defeat the Devils and their leader.
What caught my attention was this part of the story
"It is not like you, big devil, to beg for mercy, is it?"
When faced with death, the chief of the devils in the story crumbles and begs for mercy, and in the end is taken as a captive by the Monkey.
I'm starting to think Oda's building up the same "twist" for Kaido.
Basically a reverse "D" moment. Having the man who found it impossible to face death, and is envious of others who have "perfected themselves in death", break down when he finally feels what it's like to face it himself.