User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4890664-20121220093110/@comment-3146930-20121220112110

Because in a way she is. She is the only one of the seven that doesn't have any kind of special power. Even Piper who isn't really a fighter has the power of charmspeak, being able to control others. While Annabeth is the smartest of the group, in a straight up fight with any of the others, she would most likely lose.