User blog comment:Juraquille Mihawk/Hawk-Eye Haki/@comment-77.49.173.180-20110309174753/@comment-3130944-20110310063940

Rayleigh said that every strong man in One Piece have haki, why didn't a shichibukai has not. And haki is not a primary fighting way (barring Shanks) people combine their haki with their fighting styles