Finally we come back to the first sword he owned; the Wado Ichimonji.
By this very sword, Zoro swore twice to become the greatest swordsman. The Writer thinks that this is the one sword in One Piece that resembles the great sword smith Masamine. The white color is the theme, name and Koshiro’s peaceful behavior.
Wado Ichimonji is a righteous blade polar opposites to Kitetsu.
Ironically, writer believes Wado Ichimonji is the one sword Zoro has mastered the least.
What he meant by this is that each blade which has been named has a unique property or has a distinguishing feature, which is the essence of the blade. Like Kitetsu, for it’s bloodlust, Shusui, it’s heavy weight, and for Yubashiri, it’s light weight. Then the question arises, what is the essence of Wado?