I agree with this.
Another point is that I believe ashura is a combination of all 3 haki.
COC is the manifestation of the users will
COA allows a user to interact with intangible this, attack thing and form a defence
COC allow the user to sense.
We saw that asura manifested in the real world and people could see it. Kaku, Chopper etc saw it. This is coc.
Asura which is an intangible thing wasable to interact with the real world, defend and attack. This is COA
Asura was able to talk, use it senses to see, hear etc. This is COO.
This is why imo we have not seen asura in posTS. Oda is waiting to lay down the foundation of haki, explain it to use before showing asura
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If you look at this panel rayleigh says Luffy is most proficient at sensing the feelings of living things which falls under the umbrella of CoO I.e Luffy is proficient at one of the subgroups in CoO.
This statement indicates to us that there are other abilities of CoO than just sensing the feelings of living things.
Other people are proficient at sensing other things.
Zoro can hear the breath of all things both living and non living.
Luffy can sense the feeling of living things
Coby can sense the emotions of all people
Sanji can sense the emotions of women.
Enel can sense the thoughts of people and punished people that went against him
Fuji can sense the thoughts of people can even knew when they were faking being angry at Luffy ane chasing Luffy. Fuji can also sense the change in weather
Usopp's sense of sight is enhance using CoO
Each person is proficient at sensing different things using CoO. However, at the end of the day it is still CoO just like Rayleigh