Turns out king is the weakest YC1 on par with YC2 Like queen, so Zoro will low-medium diff him. Then he goes roof and after luffy, momonosuke, yamato defeat kaidou, Zoro is going to reveal himself as the real son of kaidou, his mom is from shimotsuki's clan, and always hated him for abandoning him and send him far away to east blue fearing the prophecy that his human born son will kll him, and having new son yamato to replace him both in strength and hierarcy รฎn the crew. He slays defeated kaidou and then challenges yamato to a duel for vice captain position รฎn the straw hats. Yamato will win and kll Zoro.