[quote=@Legend]
<Snipped quote by Yatagarasu>

Since the other is so different, you think they don’t have a choice? They have to multiply into the original Shion?
*Rests the knuckle of my index finger beneath my lip*
But that wouldn’t explain why they don’t split further... unless once they split, they’re missing one of the pieces they need to split in the first place...
[/quote]

Not a bad thought. Let's assume that the two of them can't split further because of your observation that they each have one eye like that of the original. If the key to splitting is having both, then they couldn't go further with just one. And given that one has minor differences only compared to the original, I think it's relatively safe to say that something else is going on than just what your mother can do. It's likely a mutated form of the same concept, but my thought is that there's an underlying factor beyond that.