You don't understand it, not that he is above YC1 but his feats are.
We saw so many good feats against the Yonkos that seeing Zoro fighting a YC1 is rather disappointing. I am not saying that Zoro will fold him, I am just saying that the fight would be a meh considering waht he did in the rooftop. If I give you a piece of cake, but not a normal one, I just gave you your favourite cake, and after you ate it and ejoyed it I give you another piece of cake that is also very good but it isn't as good as the one I gave you first. You would be quite dissapointing. Give me a King vs Zoro before all the Kaido stuff and I would be happy but after seeing what he did to the fish I can't feel the same.
And let me ask you, why would Zoro want to fight King? He saw King so many times, he even saw him blocking the path of Luffy yet he didn't give a fuck. Why would he care now?