Kaido confirmed Zoro is a CoC user that is not up for debate, there were others such as Ace and Oden from Whitebeards crew with CoC so Marco is irrelevant in this. Pg13 made a great thread about this being versatile fighter is actually a requirement to face Zoro to give him a challenge or risk is high of getting severely wounded instantly or even worse get one shotted that is just how lethal Zoro is, in that regard Queen would fall into either of those options. King swordsmanship has been the most impressive thing so far without doubt the only time he dealt some serious damage was with a blade. Kicking a ship from a waterfall blocking Sanji with kick weren't anywhere near as impressive.
Zoro said he wasn't, end of debate. Kaido was wrong about many things during the fight, and is not a swordsmanship expert, Zoro very well may have CoC, but it is not confirmed, intentionally by Oda to spark debate and troll.
Ace was the PK's son, the one WB wanted to make PK, the one who went against WB's orders and who as a narrative tool was an analogy for Luffy's potential.
Oden was Kaido's 1vs1 enemy, Luffy's predecessor to this challenge.
You mentioned vcs, that is why Marco was relevant, you can't say vcs have CoC, when the only two directly shown to have it have direct realtionships with Luffy being his mentor and first opponent he had to legitimately grow to overcome in the post timeskip.
Kicking BM's ship was extremely impressive. slashing Marcos wing and doing zero damage, or getting disarmed by Izo are not great swordsmanship feats.
You are relying that King comes into Zoro's range to get one shot, which is fucking retarded and will have shit fight choreography, vs. a fight between two flyers. Zoro has already cut Kaido's fire, fighting a fire specialist like King isn't interesting and he can't keep up mobility wise.