When I hear the term "One eyed" I think of someone who is actually missing an eye. I considered Kenpachi a one eyed character, until we learned he actually has two eyes. It just feels pretty weird to call him a one eyed character, knowing he has two functioning eyes.
Gojo from Jujutsu keeps both his eyes covered, but he can see, and has both eyes. I wouldn't call him a no eyed character.
And then you also have to figure that Sanji already has the schtick in the Straw Hat crew as being a character with two functioning eyes but always keeps one covered. I doubt Oda would do that with Zoro also.
