Thinking the non-bender is the Avatar.
I want to talk about the whole Earth King not knowing about the War. How realistic do you think this is? Aside from Long Fend and the Dai Li, The King must have had some guards of his own, along with servants. It's possible that they were bribed by Long Fend, or brain washed, but wouldn't the information somehow leak to him? After Long Fend is outed by Aang and the King doesn't want to believe them. A loyal guard would have told him that the Avatar was telling the truth, right?