User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-5.69.228.190-20130529070713/@comment-3146930-20130612195656

Yes Thanatos has a list of escaped souls, but who knows how long it actually takes to find and return a soul to the Underworld. I mean they mention in The Demigod Diaries that those trapped in the Underworld are finding new exits all the time. With all the damage Gaea did to the balance of life and death, who knows how long it could take to fix everything.