User blog comment:Kaido King of the Beasts/Chapter 770: All The Fights You Never Wanted to See/@comment-1595565-20141212002417/@comment-9022101-20141213142144

That is true, but it would still be cool to have a new ability set. Maybe it could be a fighting style with unique properties. I just think that a Haki derivative would be kind of a tired use of a previously monumental feat.