@SMXLR8: i agree with all those scailings
obvioulsy pirate king: the man above all. strongest of his verse.
yonko: big mam. shanks. kaido. kurohige.
admirals and fleet admiral: akainu. kizaru. fujitora. green bull.
shichibukai: doflamingo. mihawk. hancock. etc etc
supernovas: some supernovas are above some shichibukai and vice versa. in fact luffy defeated 2 of the 7 shichibukai.