Why would Oda say such a thing though. Clearly, he plans other stuff for Shanks.
different ways to fight with a sword.
they dont exactly all fight the same . however its more ludicrous to assume these duels were only restricted to showing skills with a blade.
only that rules it out imo is not if he has something other than swordmanship but if thats his primary fighting style.
is ashura part of pure swordmanship ?
strong doubt here, however it complements his primamry fighting style
as does fujitora's gravity
and shiryu's invisibility.