User blog comment:Killerninja123/The Mark of Athena/@comment-207.47.224.64-20120106221852/@comment-4515675-20120115081401

In the first chapters he didn't even know about the prophecy, he remembers Annabeth because Hera let him remember her. He has to since she knows about the Achilles curse and she is his driving force to move forward.

Annabeth already had a similar job in TBL so I don't think that RR will rewrite the same plot all over again. Plus, Thanatos said a special kind of demigod and then looked at Hazel so I'm guessing that maybe he was hinting about Nico.

Mark of Athena could be everything, as long as we don't have the complete prophecy from Ella and more info we're just assuming things that might prove to be completely wrong.