Peculiar plane crash

Guess you don't need me to tell you, but the plane crash in Greece earlier today is mighty peculiar. Obviously, a problem with the air is at the core of the disaster, but reports are that people were moving in the cockpit long after the problem started, and the passengers had their emergency oxygen masks on.

Surely then there were some flight attendants still able to work out what to do with the (presumably) incapacitated pilots. I mean, even if the cockpit crew all passed out due to an undetected or sudden air leak (which is rather puzzling in itself), obviously someone in the aircraft activated the emergency oxygen in time to keep some people alive. (Or is it automatic at a certain level of depressurisation?) If an attendant was alive, why couldn't they revive the pilots (or at least, taken the controls for a time and stopped a descent into a mountain?) I wonder if flight attendants all know how to use the radio in an emergency. Surely they would have to be taught?

Maybe flight attendants and the cockpit crew all passed out and it was only passengers moving around wondering what to do. Again, you would think shoving some of oxygen on an attendant would have revived one, and couldn't a passenger fly the plane at a steady, low altitude until someone could make radio contact?

If it all happened in a short space of time, it would be more understandable. But it seems to have taken place over a considerable time.

Oh well, guess we will know eventually.