User blog comment:Kaido King of the Beasts/Ultimate Devil Fruit-Haki-Rokushiki Combinations/@comment-10543621-20150517125109

Why wouldn't you add Busoshoku to the Hana Shigan combo? We've seen what Buso does to Shigan thanks to Vergo. Totally should throw that in.

In general, all the Rokushiki users should just learn Haki as well to strengthen everything more or less.