User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-3146930-20121216134503

After thinking about why Gaea wanted Percy and Annabeth specifically, I started to wonder why they were preferred over the others. It just seems like there is something about Percy that makes him a better sacrifice. Based on the type of people the seven are, I may have a theory:

Ok, so we have 4 boys: Percy, Jason, Leo, and Frank And 3 girls: Annabeth, Hazel, and Piper.

Ok, now while it isn't necessary, lets pretend that Gaea needs a couple for this to work. I say a couple isn't necessary because Gaea didn't seem to care if Piper picked Jason or Percy to die (unless she knew that Piper would pick Percy to die). Also, a couple is more likely to be together at any given moment.

So, we have: Annabeth/Percy, Piper/Jason, and Frank/Hazel.

Notice anything about these three couples? If you said that only one has an all Greek pairing, you would be right. The gods started out Greek and it is said that the sacrifice must be made at the original Olympus. Greek demigods may be drawn to that place and their blood could defile it, like what Jason's blood was supposed to do with the Wolf House.

Another common thing with sacrifices is that sometimes you need a willing sacrifice. It has been said many times that because of Percy's flaw, he would save his friends and loved ones over the rest of the world. Considering what Gaea wants him for, he could be controlled into helping Gaea rise. Jason and the rest of the Roman demigods believe more in "Duty." They can't be as easily controlled and will always put the goal first without bringing their emotions into it like Percy and maybe even Annabeth.

I'd like to see how the sacrifice thing plays out in The House of Hades.