Don't you mean Nami and Robin. I didn't see Zoro do much discovering. Anyway I'm pretty sure that they will serve another purpose than just being the ones to discover the islands origins. They can't just leave them at that. The arc is not even in it's halfpoint yet.

Another thing. Because of the MP4 format, I'm watching the subs now on VLC. Anyone know how to take screenshots using it? For future use.