I'd argue that it would be interesting if only Shanks and Roger had it. Whitebeard and Kaido are already OP from their devil fruits so it would make sense for normal people to keep up with that with a special Haki ability only they have.
Off topic but I do kind of fear how much Adv. CoC will become the norm, which arguably already has. ''Reserved for the very strongest'' my ass. What was the point in giving it to Yamato?
I was sure Who’s Who was still ready to fight after getting punched in the face, yet here we are. So very possible that Queen is done now.
Still, even if the fight is done now I think overall it was good. Tobbiroppo were god awful in comparison.
It's 100% CoC coating. That's why those fodders were knocked out. Using Haki in dangerous amounts is needed to tame Enma, so when Zoro gave everything he had he subconsciously flowed his Conquerors Haki on top of that to achieve maximum effect.