User blog comment:Pauldin91/Haoshoku Haki Master/@comment-24850639-20161011205633/@comment-24850639-20161012133935

You're absolutely right - I'm not saying that they have a "trick" up their sleeves per se, but I think that haki types can literally be combined, and that those who have extensive training/experience in it have learned how to do so. Whitebeard, Shanks, Luffy, Chinjao, Doflamingo. All people we know who have both Buso and Haoshoku. When these people clashed, there was always some kind of side effect, a strong force produced, lately some kind of black lightning, and in one case even the heavens splitting. I just think there's a whole new level of haki mastery that we haven't tapped into yet, and that those who can enhance their haki in some kind of way have an edge. Something's a little off about Zoro's, it seems to have some kind of aura to it, and somehow Luffy is able to make his catch on fire if he wants to. Its most definitely believable for someone to just have ridiculously strong buso after training 20+ years, the sky's kinda the limit with a power based on spirit.