Ngl y’all sound like me when I was coping about how Roger could still pull out his gun any at moment. Even if GB does use his sword occasionally in real fights, we’ve seen enough from him to deduce that his main way of fighting is his DF. Given that the only 2 other Kokuto forgers are WSS Mihawk and Sword God Ryuma, it seems pretty clear that forging a Kokuto is a feat reserved for those who reach the absolute apex of swordsmanship.
Bad comparison,factually Aramaki hasn´t fought anything remotely seriously, and he said he would only get serious right before Shanks arrived on Wano, before that he was:
1. Jumped by King and Queen, who he thought should have given it a rest and not have tested him
2. Restrained the Scabbards, who he wanted to give him Luffy
3. attempted to restrain the RA´s to get info on their leader
We also have offscreen:
Vs weevil, which I know you yourself point out the island doesn´t have DF usage around it
Vs Fujitora, no one really knows.
He clearly has the blade, since we can literally see the color. There´s no point in pretending otherwise, especially because of headcanon. It would be one thing if Oda or Mihawk ever stated he´s the only living wielder of a black blade, but no statement like that was ever made.