I’ve always said that Akainu possesses it, and since Aokiji fought him on equal terms for 10 days, he has it too.
As for Koby, I didn’t think he had it—until that punch; in that chapter, it became quite clear that Koby also possesses this ability.
But I’ll be honest: I’ve always believed Kizaru doesn’t have Conqueror’s Haki, and my opinion on that hasn’t changed.
Yeah, regarding Koby, I was referring to the people who kept denying his CoC even after the Honesty Impact, which was a clear display of it. People bringing up random ACoA theories were always just grasping at straws. Even though his role as a new Garp was clear after Smoker failed so badly, and so CoC was a given for him after that.
In my opinion, ALL top tiers have CoC, Kizaru included. His "Unclear Justice" is simply his worldview, just like Aokiji's "Lazy Justice" or Akainu being absolute justice. And after EH, where he basically betrayed the WG to follow his own agenda, I have no doubts left. Not to mention, it would be quite absurd for all the others to have CoC except him. The same goes for Fujitora (which shouldn't even be a debate) and Aramaki.
But as I said, this applies to every top tier. Sabo is definitely going to have it, just as Law will, and so on.
We've known this at least since Chinjao's statement, especially seeing how characters far less worthy than the top tiers possess basic CoC, and some even showcased advanced CoC after that.