User blog comment:Videogamep/More New Powers/@comment-1595565-20150424060929/@comment-24850639-20150424200104

^He fully coated his swords in pure black Buso Haki, which is something we haven't seen ANYONE do yet in the series. We've seen people like Vergo coat their weapon, and Vista against Akainu and Rayleigh against Kizaru, but it wasn't the Buso: Koka. I'd say that counts definitely.