You still haven't proved any facts. Claiming what a character did or didn't do off scene doesn't make it true.
You're the one that is claiming GB used his sword and his sword's black color is from residual coa from the fight.
That is not what's implied in the story at all.
Yes, the final argument. The sword in the shadow of the coat scene.
Shadow and black shading are completely different. If oda wanted to show the sword wasn't black, he would have.
We can't even see the entire sword in that scene, only see half of the sword. Going by that scene the sword is not as long as we thought and GB extended it for the battle because it made out of wood. There goes your argument.
"because we can't see the rest of the sword, how do we even know it's there?"
kindergarten level logic from you...
If you require people to grab a microscope to see it's a black blade, it's not a black blade. If Oden wanted us to know it was a black blade he wouldn't make it difficult.
If Oden wanted us to know it was a black blade he wouldn't make it difficult.