So Red Roc was indeed a haki based attack. And it's advCoA lvl2 that he used there, that's why Zoro and Kid are saying what they are saying, that skill is rare.
And Kaido is nearly able to outspeed future sight? What the fuck... How is anyone without it even going to fight him. That's insane.
But yeah, seems like Luffy wasn't using it during their fight in Kuri.
And Zoro now comes in two versions: Old Zoro and Enma haki Zoro. Who could have seen this coming
Interesting detail though.. If that's the right translation, then Zoro actually needs to let Enma go wild in order to pull out those uber haki attacks. I assumed that he can willingfully do what Enma does with any random sword now, solely based on much greater haki flow control.. If that's not the case, then Enma really is a freakin huge power up and not just a training wheel.
So it might be that similiar to Sanji and the raidsuit, that if both do not use their respective tools, that they are legit dropping some sub tiers in power instantly..