I think oda is a jerk, he slips into his fans, he become a spy to see fan theories about one piece and then he changes the story and then make plot twist, thats why no one can really know about one piece. And then he be like
Oda : ow thats a good theory you have there, even you include historical or someshit like that. Hehe konoyaro you think your theories will become true hah? i'll make plot twist then (smoking).