Literally Zoro didn't believe that until at the end when he couldn't fight no more. What are you talking about? Is Luffy self sacrificing cause he thinks he will lose to Kaido. Lmao you sound stupud, stop making up your own story. King doesn't have to accept it, we talking about Zoro not King. Zoro doesn't want interference, just like at a point Katakuri didn't want it cause he started to respect luffy more.
Ofcourse Luffy doesn't care. Zoro cares more about Honor and stuff like that than Luffy. Zoro literally a Samurai, honor and shit is what they known for. Luffy a pirate he says it himself. He don't care about fair. Zoro can be mad at whatever he wants. He just mad that he tried to kill him by not using his swird when he has a sword
AOkiji laid the concept out very clearly, Luffy never goes into a fight thinking there is 0 chance of winning, even against Aokiji before CoA, but he also demanded a 1vs1 to prevent Aokiji from coming after the other crew members. Reread this fight if you don't understand...
Similarly Zoro could see he was outmatched and wanted to spare the others, while clinging to the hope he could win.
No Luffy has declared he WILL win, and the stakes of the fight against Kaido are different. Kaido won't stop if Luffy is defeated, and Luffy is the only one who can (and yes he can and will) defeat him.
Zoro said he is willing to win this fight without swordsmanship and accepts King doesn't see himself as a swordsman.... then gets butthurt when King as already pre-agreed doesn't use swordsmanship against him, it is fucking bizarre and inconsistent.