Also the timing of taking over the aircraft is perfect. I read it is not abnormal for a flight to miss a certain amount of communication when flying into new airspace (i.e from Malaysian to VIetnamese.) thus a pilot would be very familiar with this knowledge as opposed to a general terrorist without commercial flight experience. Just my two cents.
He's 27, how could he possibly have more than 10 years experience? You think every pilot since 9/11 who is Muslim is suspicious?