Panel above: Lower left panel, lightning from Kata's arm before the clash.
Panel below: upper left panel, Luffy's fist generate lightning.
Panel below: Kata's fist making black lightning again without need to clash.
Oden fought using Enma easily while taming Enma which absorbed Oden's CoC and CoA. While sparring WB in "Enma-taming" condition, Oden didnt release black lightning except while clashing against WB.
while Zoro reached this "fighting while taming" stage after he decided to constantly going all-out and sacrificing his entire life just to pass Enma's test.
No one in the manga said that CoC Coating is depicted by black lightning. No one said that CoC Coating is lightning without clash while basic CoC is lightning only when clashing.
Rayleigh said, instead, that CoC is the ability ro defeat enemies without touching them. Defeating unworthy fodder by fodder knock, and defeating strong enemy by no-touch also. The no-touch is whats hyped by portrayal, while the lightning is vague hype about the person having CoC.
Kaidou's Ragnarok didnt have no-touch zone, but we can only know that Kaidou used CoC Coating due to Luffy confirming it. Luffy in 1010 also used no-touch zone visually, which is confirmed by Law (they're not touching) as a sign of CoC Coating. No one said anything about black lightning.
King didn't say "you can coat your weapon in Adv CoC like my boss?" He didn't say "Your CoC technique is better than before", but King said "so you try to become King/Conqueror as well?" "So you have Kingly Ambition (CoC) as well?" Theres no confirmation about CoC Coating here. There is fodder knock which is basic CoC, there is King stating that Zoro has basic CoC (try? To become king? Just trying instead of reaching? Etc etc not confirming AdvCoC Coat), and there is black lightning which is a sign of unclear levels of CoC.
This is why i don't "question a clear portrayal" since i dont consider this as a clear portrayal at all of CoC Coating. If anything, what Zoro used is fodder knock CoC to his surroundings, and CoC depicted in his weapon by his black lightning. If you said this screamed CoC Coating, many of Zoro's faction said that Asura in 1010 was CoC Coating as well even without black lightning or no-touch zone. This is a kind of double standard and full of agenda imo. There are like 5-6 different threads in this forum wanking a single theme of Zoro having AdvCoC, even tho it's a waste. Imo theres no reason people should be this obsessive if only they are dead sure about Zoro gaining CoC Coating. Theres no reason to call people with different opinion (like me?) as having agendas either, while 10 threads about Zoro's CoC Coating is left without even any merging etc.
Tldr: i' not sure whether Zoro's CoC is Coating or not, except if there's some more form of confirmation during Zoro's fight in the upcoming chapters.