Whos the exception that confirms the rule?..
You have, Blackbeard, Shanks, Luffy, Buggy.. Who doesn't fit?..
You got it backward.. Ironically you got Mihawk under Buggy..
It doesn't make Mihawk more special, it makes every Supreme Grade Blades more special..
Without a doubt Zoro needs to lose Sandai and obtain a Supreme Grade Blade, else he remain barely a Yonko level character like Mihawk and never a Top Top tier like Roger, Whitebeard, Rocks, Shanks and Imu..