How about we consider this. If in fact the Chinese Photos turn out to be the wreckage, then a lot of the early on statements by the Malays make some sense. Such as approximately a 40 degree heading change, a loss of Altitude of 600'.
In the case of a Explosive or Rapid Depressurization obviously get the freaking mask on, but then make a turn to diverge from your track 45 to 90 degrees, depending on where in world you are. Descent is initiated, Level Change Selected, A/T Off, Speed Brakes Out, and so on.
Probably shortly after all that was accomplished all hell broke loose.
It would certainly account for the airplane ending up in the area that the Chinese have said that they think the wreckage is.