Lol you had said one or two days ago that the theory is done, I'm not sure that it is, I think something I may forget is that One Piece always takes a long time to answer questions, when you look at the pre-timeskip and all parts of the story very rarely do questions brought up in a plot get answered in that same plot, usually they get answered much later, hundreds of episodes later, it may be the same with Carrot and Yamato,