That sounds way more complicated than it needed to be. To me, it's in the same way of Anakin's virgin birth, which struck me as a bit odd and unnecessary.^It's a theory that's been kicked about. One of about seven billion since TFA came out and AKAIK there's no basis for it beyond "she's a woman in a Star Wars movie and-also-they-look-a-little-alike!?!"
I wouldn't be shocked if it turns out to be true, but at the same time I don't put much stock in it.
It's worth remembering that JJ Abrams loves his mystery boxes more than he loves the actual mystery inside. To the point where it seems most of the time that even he has no idea what the mystery could me, he just enjoys decorating the box with randomly cryptic clues with no coherent idea of what it all means or what it could lead too.
Personally I suspect that the LFSG intentionally made sure it was vague because they themselves hadn't decided how things should play out. Perhaps wisely waiting to see what audiences responded too before making up their minds which story threads to tug on.
As for the theory, I'll just add it to the stack.