User blog comment:StaticAura/Heroes of Olympus: The Seven Demigods. Greek+Rome?/@comment-108.66.182.129-20101227041444

One of them HAS to be Percy. Percy and Jason are the "bridge". When Jason arrived at Camp Half Blood, Percy arrived at the Roman camp in San Francisco. Duh. Annabeth already said that she must go, this is the connection between the Great Prophecy and Percy.