All of Zoro's feats, not including asura mode, showed us how he can trade blows with Kaido. Blocking Hakai is the best argument because it's was a combination attack from two Yonko, it's a much stronger attack than any of Kaido's individual attacks, and the power, strength and skills required to block hakai can be used to clash/block weaker attacks.
King disarming Zoro doesn't make Zoro look bad or prove he can't clash with Kaido in a 1v1 since neither Kaido nor Big Mom were able to disarm Zoro. If anything, the 2 Yonkos are the ones who look bad in that situation. Their hakai couldn't disarm Zoro. I doubt you believe King has more physical strength than Kaido and Big Mom, especially combined.
King disarming Zoro didn't have anything to do with his physical strength. It was trickery. His sword can change to a sword breaker/catcher in an instant in the middle of battle.
It caught Zoro off guard and that was the reason he was able to disarm him.That is how King fights. Just like how his glove release spikes.
A similar incident happened to Big Mom. She was disarmed by Killer because she was distracted and caught off guard. Killer is weaker than Big Mom. He wasn't even able to pull his scythe from Zoro's body.