Is Shanks's Gryphon not included in the Grade Swords list, although it is able to withstand Whitebeard's bisento? - Quora

One Piece: Is Shanks' Sword Gryphon A Supreme Grade?

Is Shanks's Gryphon not included in the Grade Swords list

What are the Twelve Supreme Grade Swords (One Piece)? - Quora

Are swords in supreme grade in there because of its quality or its

Why are there so many swordsmen in One Piece? - Quora

Is Shanks's Gryphon not included in the Grade Swords list

What is Shanks' Gryphon's sword grade in One Piece? - Quora

How powerful is the Gryphon sword in One Piece? - Quora

What is Shanks' Gryphon's sword grade in One Piece? - Quora

Is it possible that One Piece is Roger's sword 'Ace' and Shanks