User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-202.156.13.10-20121112141619/@comment-67.7.106.88-20121112213126

Theres also Fire = Leo. Think that would make more sense since leo is one of the 7 and RR didnt say if he was include characters from the kane chronicles into the HoH or book 5.