Just a note, If it isn't already being looked into, There needs to be some sort of check to make sure you have your default selected avatar actually unlocked.
Zeus, TM, Robo, And all others except Hermes can be set as your default, And even if you don't have them unlocked (Speaking from experience with Demis And what I have been told.) It still puts you in the avatar.
So theoretically you could mod your default avatar to Zeus if there were no safety precautions.
I am not 100% sure how this works with gamertag bound avatars, But I have been told it would work.