so?mihawk used
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as a sword and kuzan made it out grass......
not really you can't tell the difference as we're yet to see a yonko go all out or even fight aside from WB
You're being too literal, anything that is used as a sword is still a sword.
Actually kaku disproves your point and here's way.
1-kaku didn't have the two swords with him in his first appearance and yes you could argue that he was keeping low for his mission but still, after the cp9 uncovered their identity in water seven he still didn't have his sword. Not even when he was in the train or when he was standing on the top of enis lobby.
2- kaku never used his DF to make his swordsmanship better, that was only law.
Guess who was a swordsman as well?
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Yet he's here using a gun in a different place. Franky is also definitely not a swordsman yet he used it in the general franky robot.