I think a brick throwing savannah is involved in the disappearance of Malaysia flight 370.
LOL, I have been in a forum group of Airline Pilots making their guesstimations of what happened... So now.. You asked for it so I am going to give you my opinion coming from an Airline Mechanic/Maintenance Controller.
If the plane had crashed just by hitting the water, there would have been debris floating everywhere, in particular the seat cushions. If it had exploded in flight it would have been spread over many miles and floating... Seeing how there is no evidence, the aircraft turned off course in a controlled manner, and certain parts of the communications were disabled at different times the A/C was HiJacked, and in this case I think it is by the Flight Crew. The flew up to 47,000 feet, depressurized the a/c and thus everyone went to sleep to never wake up, mean while the person flying the plane was on Crew O2. They returned to normal altitude and depressurized the plane, now there is no one to fight back. They then find a place in the water to gently land that is well outside of the flight path and search area, gently landed on the water and let the plane sink. I think the entire episode is either "Pilot Suicide" or "Highly Skilled HiJacker" and once the plane is found in tact at the bottom of the ocean that a terrorist group will come out and claim credit, or the HiJacker was just on a suicide mission and took everyone else along for the ride. With this plan, there would be no witnesses. I hope that I am wrong, but nothing else can really explain what has happened.