Heh you seem to stand quite behind in processing the arc. Did you catch up to the ZDK / ZKK paradigm my man.
Goalpost shifitng what ZKK means is lame, every non ZKKer was saying the only
way Zoro would kill Zoro would be through execution, ZKKers didn't find this acceptable before 1010. You are now a ZEKer (Zoro executes Kaido).
But Zoro isn't killing or executing anyone, because Luffy would kill if he wanted to kill, because Kaido doesn't deserve a glorious death, because Yamato is still his daughter, because Zoro is a hero to Japanese children.
This is an arc 400 chapters in the making for Luffy to show to the world he is the top pirate king contender - having Big News morgan headline "Kaido defeated by Luffy", only to have page 6 news be "Zoro kills Kaido" is Stupid
and Zoro isn't outshining Luffy on the world stage for this victory.