This will be simple. Literally every living being has all types of haki(being 3 or whatever the bullshit voice of all things is) and you can't proof otherwise.
Rayleigh already stated that everybody(not sure if he said people or living beings) have at least armament and observation, just need to unlock and train.
The real thing comes with Conqueror's Haki.
We have Luffy using it at Amazon Lily fully for the first time. And we have him using pre-Sabaody Arc to intimidade an animal.
Obs: This is basically what Zoro did post-timeskip, he first intimidaded Monet than he used Adv CoC against Kaido(or just Regular CoC).
So Luffy who is suppose to be JoyBoy and all that bullshit prophecy along him only unlocked at age 17. While we have both Ace and Doffy unlocking the same Conqueror Haki at age ~11.
So people can unlock in different age, there is no rule for that. Also the qualities of the King... is pure bullshit when we have people like Chinjao, Ace and Katakuri with it.
Conqueror is not passed from father to son, so Roger and BM having it and acting like King/Queen doesn't mean Ace and Katakuri should have(BM has a bunch of kids without it, or they have it too?). Ace lost any quality when he submitted to WB, he had no dream at all and his "only dream" was to made WB a Pirate King even though WB never wanted.
Katakuri also has no dream at all and is just BM's puppets.
Chinjao... need to say anything? Lost every will he ever had when he lose a combat to Garp(which most likely have CoC).
What I want to say is that, giving all those informations, literally Oda can make any character have CoC and we will just have to accept.
Since chapter 1010 having CoC is great boost for fighting because of Adv CoC. So I'm expecting few Marines to have it (Akainu, Aokiji, Garp and Coby) while other characters too (Mihawk, BB, possibly Weevil). So that "rare" haki will be more common than rare DF's like Ancients, Mythicals, Logias...
Rayleigh already stated that everybody(not sure if he said people or living beings) have at least armament and observation, just need to unlock and train.
The real thing comes with Conqueror's Haki.
We have Luffy using it at Amazon Lily fully for the first time. And we have him using pre-Sabaody Arc to intimidade an animal.
Obs: This is basically what Zoro did post-timeskip, he first intimidaded Monet than he used Adv CoC against Kaido(or just Regular CoC).
So Luffy who is suppose to be JoyBoy and all that bullshit prophecy along him only unlocked at age 17. While we have both Ace and Doffy unlocking the same Conqueror Haki at age ~11.
So people can unlock in different age, there is no rule for that. Also the qualities of the King... is pure bullshit when we have people like Chinjao, Ace and Katakuri with it.
Conqueror is not passed from father to son, so Roger and BM having it and acting like King/Queen doesn't mean Ace and Katakuri should have(BM has a bunch of kids without it, or they have it too?). Ace lost any quality when he submitted to WB, he had no dream at all and his "only dream" was to made WB a Pirate King even though WB never wanted.
Katakuri also has no dream at all and is just BM's puppets.
Chinjao... need to say anything? Lost every will he ever had when he lose a combat to Garp(which most likely have CoC).
What I want to say is that, giving all those informations, literally Oda can make any character have CoC and we will just have to accept.
Since chapter 1010 having CoC is great boost for fighting because of Adv CoC. So I'm expecting few Marines to have it (Akainu, Aokiji, Garp and Coby) while other characters too (Mihawk, BB, possibly Weevil). So that "rare" haki will be more common than rare DF's like Ancients, Mythicals, Logias...