The thing I guess I like most about Kaido is that he's so brutal and unreasonable that he actually does a 360 and it makes him kinda go through reason and consideration in the process. Like he kills someone who helped him win a fight as a sign of respect to the guy who almost killed him, even though he was just fine seizing the advantage. We see him drunkenly sobbing over Doflamingo... knowing that the latter man believed Kaido would come split his skull for that failure. He had an older ally, a guy he hung out with for longer than the protagonists have been around, who he killed without any sort of hesitation. Meanwhile he's just fine with forgiving Asura for past and present transgressions.
His will breaking concept is maybe the only decent extension of oda's reluctance to kill. He doesn't really kill people who can't beat him, and it's so much worse. Hawkins didn't know anything about Law having some of that same mindset but he was right in saying it was on another level. Kid and Killer fought till they couldn't move and woke up from what seemed like it should've been death only to find themselves bent over. One of my favorite things in Wano was that guy in prison who dropped at the discussion of the rebellion. His fucking body couldn't even take the idea, all he physically and mentally recognized is Kaido's dominance. They say in that scene that even Kinemon would be broken... and he was. For all that talk about giving his life in the battle, Kaido spared him and did his wororo while the guy had nothing else but to cry and plead on the floor. Rather push flowers than be in the pen sharing showers... being a bitch is so much worse than dying, and Kaido is the OP champion of that.