Chapter Discussion - Rokushiki is based on Haki, Page 6

Right Lucci had to rely on mainly cutting/slash type attacks for effective purpose, while Luffy was putting a lot of stress on his body thanks to G2 at that time. If it's haki then his blunt

In One Piece, why do the members of CP9 learn to use the “six powers”, but not haki? - Quora

Haki and marine six powers : r/OnePiece

Would you rather have a strong Devil Fruit or strong Haki/Rokushiki? - Quora

Completely unrelated but haki seems to give less/no resistance to awakened devil fruit abilities : r/OnePiece

Was Rob Lucci's Rokuogan an application of the advanced Haki that Luffy is learning now? - Quora

Chapter Discussion - Rokushiki is based on Haki, Page 8

Hasshoken, One Piece Wiki

Rokushiki is based on physical strength is actually based on a mistranslation in earlier One Piece volumes : r/OnePiece

Rokushiki is based on physical strength is actually based on a mistranslation in earlier One Piece volumes : r/OnePiece

Shigan, One Piece Wiki

Rokushiki explainable as Haki? : r/OnePiece

In One Piece, why do the members of CP9 learn to use the “six powers”, but not haki? - Quora

one piece - What skills introduced prior to the formal introduction of Haki are Busoshoku Haki based? - Anime & Manga Stack Exchange

Geppo, One Piece Wiki