@FelRes:
Seriously, this thread made One Piece like so much more interesting to think about.
I agree with that sentiment. I love the idea. I was kind of iffy reading the first post, but after thinking on it and seeing some of the support I'm actually leaning towards it. Seems like a great idea. Also falls along Oda's idea of "mind fuck". Lastly, don't know why everyone assumes those flashes to islands/characters matter. They're just silhouettes and placeholders. Look at the original imagining of the Shichibukai or Yonkou. Obviously these things can change. Even if that was actually Raftel we saw, how do we know it isn't on a different planet? Or a portal to it? Or, shit, even a piece of land from a different planet. If Skypiea can shoot up and stay, why not something shooting down?
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Upon reading into info on One Piece Wiki (I know, I know) I think there may be actual creed to this theory. For one, look towards Gol Roger speaking to Whitebeard. He begins his story as "A long time ago far, far away." I realize this is probably just a colloquial thing, as just the way of beginning a tale, but it could be that he was being literal. Even more intriguing is Blackbeard's body being described as abnormal, and Whitebeard saying he isn't a "real" D. Could just refer to Blackbeard's morals and odd fear of death, but what if there was something more? Could Blackbeard perhaps be an alien who's somehow assumed the form of a D?
Then we have the whole thing with Bonney going on that leads one to think exactly what that is about....
Basically, I'm just saying it's possible. Don't throw it out just yet. Didn't Oda once say he wanted to do a Sci-fi story after One Piece anyway? If you're stuck writing the same thing for years might as well include it in there.
Also, Spaceys. "The story of the ancient spaceys is that they were created by the ancient inhabitants of the moon. When the inhabitants of the moon ran out of resources, they left behind their homes and the spaceys, heading off to the blue star leaving both sides saddened by their separation."