^A sword does not make a swordsman though and titles (either yonkou or shichibukai) don't actually boost the strength of someone. Who is to say mihawk would not have been able to become an emperor had he actually wanted too(he clearly has no pirating ambitions otherwise he would not be a shichibukai)? MIhawk and shanks took different paths however don't see how that necessarily reflects in a difference of strength. I have a hard time believing shanks could have grown so much more than mihawk after their duels ended overall. Not to mention mihawk for plot purposes necessarily has to be that much of a beast considering zoro's goal is to defeat him and generally zoro has shown to be roughly equal to luffy in terms of fighting capacity.