I think you make a good argument, but I think you'd appreciate discussing that with someone else more.
I do understand what you're saying, though. You're saying Conqueror Coating is another layer on top of the AdCoA. I don't think we disagree on that element of the discussion.
What I disagree on is the idea that Color of Arms users are more capable in the Color of the Supreme King.
As far as weak weapons being wielded by strong guys, yes, they can use them. I wasn't arguing that they can't use them, I was just arguing that they're not suitable weapons. I think we can avoid that discussion because it only involves minor discrepancies.
Most arguments occur because of minor misunderstandings, we shouldn't turn this into one of those. Thank you for correcting me, I used the wrong words to say what I wanted.
"Color of Arms users are more capable in the Color of the Supreme King." I could tell that's what you were getting at if I understand correctly. You're talking about someone who is a CoC specialist, as opposed to an Armament specialist. Like that sbs states about Zoro and Luffy/sanji.
From what we're finding out, like with the CoC barrier, there
could be other manipulations of CoC that a CoC specialist could excel in over an armament specialist. Now it makes more sense why you were trying to create such a distinction.
You're asking: Is the CoC armament luffy was using in g5, that Kaido commented on as a shield essentially, the same as this CoC barrier that both Xebec and Harald have used as a defence against other CoC users. That's where you want to know where Armament ends. Or Shanks wifi haki for example.
I think that from what we know right now, the xebec and harald stuff is simply the use of ryuou, like is needed for armament, to create a shield around the users body (with CoC), what Xebec did when he knocked both Garp and Roger back, might be him expelling his conquerors in a burst, when he swung his sword and split the sky for example. But instead of just flexing haki like usual CoC to K.O someone, it can be more like extending that barrier and pushing away with it.
But obviously these distinctions can be made more clear later on, either way it's going to depend on the user, an armament specialist can be greater than a coc specialist at CoC overall, or vice verca. Maybe for example shanks excels in creating this kind of barrier > Mihawk, whereas Mihawk excels in armament haki that aids him in cutting through that barrier.
And with that barrier even if you were going to get hit/cut 100%, it could lessen the damage/force/strength of the attack, because of the resistance before it hits, and potentially making the attacker use more haki to get to the defenders body and having less haki in the actual attack.
But if that is simply just advanced armament like hyogoro described, it can just mean there is a type of armament that with CoC, a CoC specialist can excel in over other CoC users/armament specialist in the weapon sense.
It more comes down to the utilisation of haki that anything else, that's why scopper is making a big deal of how luffy and zoro utilise their CoC consciously.
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I don't think you should need CoC to create a black blade, from the perspective of narrative. But I do think the end result is going to vary depending on the user, because not all black blades are going to be created equal. Someone could do it with their conquerors haki for example, which literally scales with their base strength, which might then lead to the blade being
even more durable than another black blade.
That may be how Zoro breaks Mihawk's Yoru if that does indeed happen, maybe Zoro forges Wado into a stronger black blade, and the force of both Mihawk's and Zoro's haki clash has so much pressure, that Yoru can't withstand it whereas Wado does.
and whatever black blades have yet to show 
