User blog comment:SayuriDarling/The Hidden Oracle Official Discussion/@comment-26658481-20160112184726/@comment-26658481-20160112192449

Uncle Rick said he got the idea from writing Greek Gods, but Blood of Olympus is released only a couple of months after, which means the book was written, just some editing. It may or may not refer to Apollo. I guess I'll just ask him on Twitter :)