Mihawk was only able to rise a Great Grade Blade level Sword into a Supreme Grade level Sword.. That's his ceiling as
a Swordsman and the reason why all Supreme Grade Blade wielders have not turned their Blade Black, it's an unachieved
exploit that is even impossible for Mihawk.. And as you know, most of the top tier wield a Supreme Grade Blade, not a Great
Grade Blade which they could turn Black.. Basically Mihawk went the easier route, when Roger, Shanks, Whitebeard, Nasjuro,
Fujitora and potientally Garling are still trying to create a Black Blade with the most arduous rank, the Supreme Grade Blades level..
a Swordsman and the reason why all Supreme Grade Blade wielders have not turned their Blade Black, it's an unachieved
exploit that is even impossible for Mihawk.. And as you know, most of the top tier wield a Supreme Grade Blade, not a Great
Grade Blade which they could turn Black.. Basically Mihawk went the easier route, when Roger, Shanks, Whitebeard, Nasjuro,
Fujitora and potientally Garling are still trying to create a Black Blade with the most arduous rank, the Supreme Grade Blades level..