Like Kuri developped his COO to the point of getting FS but somehow never managed to yo make the jump to aCOC which is apparently trivial as long you can use the base version
The only justification I can see for this is the fact that Katakuri never personally never fought an ACoC user and may not even know it’s possible
Luffy
saw Kaido coat his attacks with CoC but he said he didn’t realize it until he got hit by his Ragnarok attack
What that tells me is that actually
identifying it/knowing you can do it is a pretty big deal
That’s why Yamato having it makes sense imo. We know for a fact that Yamato challenged Kaido multiple times over the years and that’s how she got so strong
It’s only natural that she would EVENTUALLY figure out that Kaido’s coating his attacks with conqueror’s as well
Katakuri on the other hands is subservient to Big Mom so I doubt they ever fought and if they
did (most likely for training) I’d be surprised if it ever got to a point that Big Mom would whip out ACoC against him
I apply the same logic to Doflamingo as well. Who’s never fought someone with ACoC and wouldn’t have an ally that’s willing to tell him it even exists
And that’s on top of the fact that based on Zoro’s experience it clearly isn’t an easy thing to do. He spent the entire “fight” with Sommers trying to figure it out (as a haki prodigy)
And that’s in conjunction with the confirmation we got that infusing yourself with conqueror’s haki
doesn’t follow the same process as armament haki. It was completely foreign to Zoro, despite being a master of flowing his haki