@Den_Den_Mushi can you translate what Zoro says in this panel?
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According to the people here, Ryuma having a black blade is evidence that he was stronger than Oden, but when I say that it's too early for Zoro to make a black blade since even people like Shanks don't have one, then ya'll suddenly claim that you can create a black blade and still be weaker than some swordsmen without a black blade...
So using that logic, Ryuma having a black blade cannot be used as proof of him being stronger than Oden