They go a lot farther than most characters do. I'm not saying one of them should win, but I'm sure they lost to characters who didn't deserve nominations, because One Piece isn't that popular on /a/
Kamina is the prototypical GAR, but it doesn't make him the most GAR. I'd vote for Usopp, actually, because he fights against his own cowardice to overcome insurmountable odds, instead of having hax uber-confidence for no real reason.
I don't believe in voting, though.