User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-111.193.219.138-20121008151352/@comment-25044414-20121011145904

I've actually read a similar theory to this and, although I do not want it to happen, it is actually quite reasonable and possible. :( I agree with Albus Chase, I think Percy will find a way for Annabeth to go back if this happens.

The Nico part, though, I really do not like but, again, possible. I think Rick might just kill off a beloved character in this series. He, among several authors, emphasize how not all main characters are safe from death, especially, in this case, demigods.. so he might just kill Nico, too. :( :\