User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-97.120.151.225-20121221100917/@comment-76.245.8.194-20121222003928

That's the theory I've been going with. Personally, I hope Leo gets to do the honors, since he actually has a bone to pick with Gaia. Basically I want him to walk up to and say (in a spanish accent)  "My name is Leo Valdez. You killed my mother, prepare to die."