Glad you brought it up Trolling king, now I can read it to... and by god... wow.. This is all so legit!
Usually when people theorise like this, you just kind of have to roll your eyes as it sounds more like "Fan wishing." than thought-full speculation, but this.. this could very very easily be exactly right and just what Oda has planned.
And man this is extremely interesting, it is indeed, extremely fascinating to think that an Author has been able to plan that far ahead, and know exactly where he is going.
And that author also being the man who is insane enough to make up the world of one piece in the first place, which upon the surface looks like a mess, but ones you dig deeper, you realise that the structure and planning in this Manga is just... up and above, compleately mind boggling.
I am so glad I got into this manga, just so I could exsperience some-thing like that, and really try to let it sink in. It's exceptional if you ask me, and well, as a writer, I am so glad to go over all of this and analyze it, because it teaches me that doing things like that is in fact.. entirely possible. If you are clever enough to do it.
Just.. by god. That's amazing!