its can be superior and his way of the blade can be inferior too but we can agree that Haki is essential to swordsmanship
which can be dissected into
Haki, strength, skill with blade
basically swinging your sword in a very sophisticated way against yoir opponent .. haki just complements the skill and adds more flexibility to it
but Coc zoom call and CoC coo sabotager are more like intentional uses.. if Shanks can spam it then the just has an unfair advantage.. so its like when Mihawk uses some fancy Coo.. Shanks sabotages it..
to marines i think Haki is comparable when tl comes to Shnaks its just one arms less Mihawk has more "subtlety of blade" kinda thing LOL
CoO aids in swordsmanship. CoO sabotager fucks with what's aiding the other person in swordsmanship. So it's definitely part of swordsmanship just like CoO or FS would be.
Idk how CoC zoom call functions. Sounds kind of passive and irrelevant to combat, though?
Again, if Shanks trump cards turn out to be shooting haki lasers out of his eyes or something, then a good case can be made for it. But I think a canonically confirmed swordsman would have his strongest attacks be about actual swordsmanship tbh.
Though currently as things stand, Shanks hasn't shown anything that is outright "excluded" from swordsman ship, either.