Because GB made it clear that swordsmanship isn’t his primary fighting style, and it would make 0 sense for someone like that to have a black blade
Yeah, like Aokiji that before (almost) chapter 1100 probably didn't throw a single punch in the entire manga and then we discovered he was a brawler?
Everyone has an opinion about Aramaki's blade and that's fine, but:
- the sword is black/dark in the manga chapter and official (revised) volume;
- we haven't seen Aramaki's serious style at all, just like we did with Kizaru's "guard" and Aokiji's CQC before their big fights.
And we have seen Kizaru and Aokiji much more than Aramaki.
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But again, when the manga shows his sword once and it’s black, what’s the conclusion supposed to be? He was using armament on his sword tucked in his belt?
They don't like the implications (understandable, but still), so they won't admit under any circumstances that was just logic question.