User blog comment:Darkcloud1111/It's All Connected/@comment-4515675-20111015182608/@comment-108.86.176.201-20111023163720

Yup, Reyna seems connected to all of them in some way. It's not just coincidence that RR gave her a background where she's already come across Percy & Annabeth. I think she'll become more important in the series as it progresses.