I'm anxious to see if Killian returns. I could see the twist twist...but it would have to be done executed without cliche's. With Killian having dragon tatoos on his body it would seem he was serious about it. Maybe Trevor was acting and he was The Mandarin and Killian was his son. Killian did speak of his father being an idiot. Maybe Trevor was the boss and Killian wanted to be in charge and felt superior because of Extremis and was hell bent on being the actual Mandarin. Maybe Trevor being a goof was an act in front of Savin too. I am reaching really far. Now that I've wrote it and read it, it seems unlikely and would be extremely complicated.