User blog comment:Neowitch/Zoro's bad Memory/@comment-3119203-20120202134009

My Theory: He's retarded.

Ok, so like you said, he said "forget this duel happened". It has also been two years since he got this sword, and during his training I doubt his focus was on some two-bit zombie that he kicked the crap out of with two swords. Sure, you would think he remembers where he got his sword, but that isn't his job to remember things. Cut the guy some slack, even you don't remember every single little person you talked to two years ago, even the important people.

You might all even be misreading this. He might know what samurai are, but does not know of a country of samurai. Hence, the question. Or he is just stupid. Either way, Oda needed some way to introduce the samurai, and what better way to do it then through the to swordsmen?