Not that much odd though.now everything making sense while simultaneously not making sense lmao. what are the chances that the actual og seven of shadow garden are copycats of heroes?? once is coincidence but twice is foreshadowing imo
The Three Heroes are basically those who had been experimented on and infused with Diablos blood/genes, and a sign of that Diablos blood is the condition of "Possession".
So far, girls with Possession have either been killed-off or taken into custody by the Church or the Cult (were they are either experimened on or discarded).
Leaving those aside and the ones related to the Royal blood around the world or whose blood haven't reacted yet to Possession, the majority of Heroes Descendents/Diablos blood carrier are in Shadow Garden (around 700 of them).