User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-10487081-20130508022521/@comment-3146930-20130508032618

Not to mention Percy hasn't even been in Long Island yet in the HoO series, making meeting Carter impossible at this point in the series.

(He was asleep in TLH, no memory in The Son of Neptune [and he clearly has his memory in the Son of Sobek], and he was busy for all of The Mark of Athena)