User blog comment:Neowitch/Zoro's bad Memory/@comment-3075024-20120202123940

Zoro is blessed with sheer will power of erasing his memory at will, .. .. .. or lets just say that this is not the first time Zoro has forgotten someone or their name *coughHellomepocough*. Still, it annoyed me too cause Zoro is well aware of Samuraies but yet he asked Brook to explain him then detailed structure of Samurai of Wano country.

My theory

He forgot.