From the recent Vivre Card info, Oda revealed that he was going to have Mihawk’s Epithet as “Clairvoyant”. I think he chose otherwise because it would draw too much attention to Mihawk’s Observation Haki abilities which he was planning on revealing possibly in the last fight with Zoro.
So far of course we’ve seen all manners of Observation Haki abilities so this new one that Mihawk has, has to be first of all, foreshadowed and secondly explained in order to prevent it from seeming like a random power Oda is creating at the very end of the series to raise stakes.
This theory therefore is going to describe this unique ability, how it’s been already foreshadowed and why possibly only Mihawk might have it(unless Zoro picks it up as well at the end of the series).
Description: This Observation Haki allows someone not only to pick up on an incoming attack like every other Observation Haki, but also allows them to pin point the weaknesses in the attack.
Foreshadowing: During the Zoro and Mihawk fight, Zoro’s Oni Giri Attack is stopped in a way no other attack in One Piece has ever been stopped. Mihawk didn’t dodge, parry, or block the attack which are the main uses of all Observation Haki in the series, Mihawk completely stopped the attack from working. This is somewhat equivalent to Katakuri stopping Luffy from using gear 4 that one time but we know for fact that he was seeing the future to see how gear 4 is activated. But in this case Mihawk finding the exact point in the Oni Giri Attack that dismantles it can’t be obtained from seeing the future alone, that would require one to have seen the attack a number of times in order to see a fraction of a second where the weakness exists.