Quote Originally Posted by elm13 View Post
the fact that the arcs in one piece coincide with each other makes me really feel excited^^
The arcs coincide with each other? I hate to say this, but unlike other series. All of the One Piece arcs are continues and are not forgotten and they built to the current chapter.

Once One Piece is finished, all of us will look back and go, "Holy hell, so when _______ character referred to ________, it meant this."

Like for prime example, Shanks and company at the end of almost every arc, that little hint shows that Oda knows how to tell a story. Since once Shank's story is put together, it will display the back story of series.