User blog comment:Girou angelsinzz/Twin Paradox Slayers/@comment-7418318-20140707181931

With the personality similarities, the fitting hair-colours to one of their potential parents and their fixations on their respective father I can see where the theory is coming from.

But at the same time I think it's unlikely that the two are split up, both are found by a Dragon who for one reason or the other make them kill them and then end up in the same guild by chance.

Also why are they solely attracted to their fathers, but not their mothers?

And that they are drawn to each other and their fathers would hint that their memories are still there, but somehow blocked, but despite them being influenced by those memories subconsciously, none of their old memories ever surfaced?

It's an interesting thought, but there are too many unlikely parts and coincidences to this theory for me to truly believe in it.