He's not saying that. He's saying that based on what he took to be hints that Ellone and Rinoa could be the same person, this is another theory I don't follow 100%, but I can see how he arrived at it. It's not just because of her hair, but her general design, and the fact that one of the Rinoa clones really does look like Ellone (at least I think it does), further more there are many other potential hints to them being either the same, or at least versions of one another, for example their names have the exact same root, and the two of them act similar. I'm not saying that Rinoa IS Ellone, but I can see how FE interpetted these things to be hints, his theory actually makes a lot of sense if you read it through. It's certainly better than R=U in anycase which just seems to be pulled out of thin air. (The only thing that seemed to based on was the fact that in the ending Rinoa and Ultimecia were shown a split second appart from eachother - using that logic you could also say that Squall and Zell are the same person, because the same thing happened with them - that scene is just Squall's memories corrupted.)
No. Fanfiction is when someone makes a story based on an originally existing franchise. FE's theory is based on how he saw the game, and I will admit some of it actually helped me understand the game better. It's like how I intially thought based on "hints" that Ultimecia also appeared in Final Fantasy VII, but I found official sources that disprooved that. So I don't state it as "fact" anymore, and I realize that those "hints" were'nt "hints" after all, just how I viewed them, and even today they still make a whole lot of sense to me, even though I know they're wrong. They are not fanfiction because I genuinly thought that they were what Square was trying to say.And don't tell me that it's all plainly explained in that theory of yours, because frankly, it belongs to the fanfiction section... and it's not even a good fanfiction