If your eyes and the manga are not enough you should see a psychiatrist help, because the blade was black in all canon material, sorry.
And zoro worships Luffy, to the point of going on all 4 like a good dog to beg his """rival""" to please make him useful for Luffy.
Or when he decided to die after Luffy saved everybody in Thriller Bark, like a good subservient underling.
Have you been reading two piece again, where zori was a relevant character and not Luffy's dog?
Here we go again with that stupid argument that I've counted hundreds of times.
The way that the manga identifies black blade is by telling us it's a black blade. Only two blades in the manga has been stated to be black blades. That means those are the only two black blades.
Cracker's weapons look like real metal swords but in reality their biscuit swords. So going by how a blade appears is not a good way to determine what it is.
You posted all that nonsense and still hasn't provided scene where Zoro wanted to be captain. You should be thankful Zoro was willing to humiliate himself to grow stronger. If not Luffy would have died on the rooftop. Even with the help from two other captains they weren't strong enough to deal with hakai.
Their captains title was not enough to protect them. They needed an underlying to do what they weren't strong enough to do. All they could do is run away like scared bitches hoping somehow they could survive that attack.