He used a bladed knife

He also didn't consider Zoro a "worthy" opponent till later

In Marineford he used Yoru on everyone including fodder

GB fought King and Queen + the Revo commanders while "struggling" (he wasn't I know) with the latter and still chose not to use his sword
It's also the fact that, out of all characters who could have a black blade, why the hell would it be GB?

Not Shanks, Mihawk's canon rival and almost definitely the 2nd strongest swordsman alive as far as we know.

Not Roger, who had a supreme grade blade and loved it so much that he named his son after it.

Not even Oden, the greatest samurai to come out of Wano since Ryuma lmao.
 
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