This came up in my very first play. There was somewhat heated discussion on how it should be resolved. It was not a very enjoyable way to start a first play. I actually think it's an advantage for the Master of Shadows to start with Treason cards. That way he can start using his abilities right away. But in the end 1 more Treason card at the start of the game isn't going to hurt you. One more at the end of the game though could be killer.