what [/quote]I think they meant "kept raising the retarded yukkuri", unless incest happened.
And that's how the "Yukkuri's-Accessory-is-Identity Theory" was brought forward.If the accessory can take it easy, then there's no problem.It is because her accessory can take it easy, if you'd ask why.The parents kept breeding the retarded yukkuri without any suspicion.Fragile as baby yus are, they can't strengthen themselves and prolong their lifes by eating poo-poo.Without anyone's caring and protection, the well-developed koyukkuri's short yukkuri life reached its end.