For a decade, the fandom has conflated two distinct categories: Great Ones (beings who seek children and lose them) and Great One Organs (separated anatomical principles that exist as independent kin). This misconception is still creeping into even my newer essays. What players encounter as "Great Ones" throughout Bloodborne—Ebrietas, Rom, Kos, the Amygdalae—are not Great Ones at all. They are Great One organs: separated parts that have ascended to independence but retain no generative desire or capacity. This is why Rom drops kin coldblood, why multiple instances of the same "Great One" appear in Chalice Dungeons, and why most entities the community calls Great Ones show no interest in bearing or losing children.
The actual Great Ones are those who embody the cycle's generative tragedy: Oedon (the formless principle that incarnates once per civilization), the incarnation itself (Queen Yharnam in Pthumeru, Laurence in Yharnam, Maria as Isz's foundation), and the children they lose (Mergo drowned in water, Flora evaporated in fire, and the future child Maria will lose to continue the pattern). Flora's manifestations—the Moon Presence, the Doll, and Maria in the Nightmare—are extensions of her as Great One. Everything else the fandom labels "Great One" is kin: organs separated from the dissected or distributed bodies of actual Great Ones, ascended into independent existence as anatomical principles rather than generative beings.
"Every Great One loses its child" applies only to actual Great Ones—those who attempt generative fusion of incompatible elements. The organs cannot lose what they were never designed to bear.