User blog comment:Zolodabeaast/Proof:Zoro Is The First Mate/@comment-3242083-20110809173345/@comment-3242083-20110809205152

Luffy: I have decided. You will be our sniper!

Usopp: Alright, I guess I can settle for that for the time being. But if you ever chicken from your duties...I will take charge as the captain.

Luffy: Alright, fine.

= Usopp is the first mate. And this came straight out of Luffy's mouth in a non-comedic way.

But whatever, this will never happen. The SH's don't have a hierarchy like that, Luffy is the unquestioned captain and thats it. There is no first mate or whatever.