I think Douglas and Adam really ARE Coco's creators (one of them, anyhow) ... however, I think they are hopelessly nerdy guys who would rather tell a story about themselves than admit they made her up. Or maybe one of them has a little brother that made her up, and they don't have the nerve to say they adopted her from a kid bro.
So, I think they did create Coco, and borrow her, and just told a white lie to make themselves look like explorers.
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