You have no frame of reference for the "rooftop feats", so placing Zoro way over YC level based on them is pure headcanon.
We are about to see the extent of Zoro's powers in a bit 1v1 fight. You can't omit that.
Are you saying Zoro didn't:
- use high speed and blitz Yonko
- block and tank hakai, a combination Yonko attack
- cut and scar Kaido
- scare Big Mom
- cut off a giant horn with an attack that shook the island
- use larger and stronger barrier haki than Luffy
- use some form of adv CoC
- best a Yonko in CQC while in poor condition
It happened and I don't care what you call it. Zoro showed amazing feats against Yonko and outperformed the other SN and Yamato.
Zoro facing King doesn't make Zoro look weak but King look strong. We still don't know much about King and based on his current feats he is stronger than Katakuri and Marco. He hasn't been serious injured or push to hybrid mode. He stopped Big Mom and her pirates alone. He showed no fear towards Big Mom when he refused her request and no fear towards Kaido when he used his authority (name). He still don't know if he was the former warden of Impel Down.