You just made this requirement up, it is said nowhere
He showed it in his prime in Oden flashback so it's a good proof enough he had CoC coating.
And why would Oda show WB flashback again? If he did not have it then he did not have it. This if and if is pointless unless it's confirmed in the manga. WB was unable to achieve FS just like Garp something you ignored lol.
And why would Oda show WB flashback again? If he did not have it then he did not have it. This if and if is pointless unless it's confirmed in the manga. WB was unable to achieve FS just like Garp something you ignored lol.
we didnt see wb fight fully
im following your logic
any new advanced haki wb and roger didnt have because they never showed it