User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-24.211.252.174-20121031205341/@comment-3146930-20121107013858

Ya, I agree that he hasn't mentioned the Kane series in the PJ or HoO series, despite all the mentions to the PJ and HoO series in the Kane series. It may be because PJ was his first series and it kind of gets all the attention. There may be a mention or two in the Norse series.