I don't need a panel
countless superior swordsmen than twerkbull
who were non df all failed to forge kokuto
And before you bring up Oden, Oden was never said to have wanted or tried to forge a black blade.
Hitetsu only commented that Enma is not a black blade, that's it.
Also, Oden is just a samurai with mere great swords meanwhile we have Admiral like Fujitora with supreme, meaning that 99% GB's sword is also a supreme one. So nothing says that Oden is better at swrodsmanship as well.
So a df merchant like him has even lesser chance of achieving that feat
Did Roger overpower WB in a haki clash because WB is a DF "merchant"?
Is Joyboy's haki weak because he's a "df merchant"?
What about Goofy? You're gonna claim his haki is the weakest in the crew because he's using his DF the most?
We know the only two confirmed kokuto wielders don't use any df on top of that they both live and die by the swords. Sorry your boy has nothing in common with those two
What you named was their irrelevant boring characteristics. You can't blame GB just because he's good at multiple things while those 2 bums can only be good at 1 thing.