Speculations;
Several eyewitness reports state the aircraft was airborne before crashing.
If this was the case, at that point, most pilots in most situations would
not attempt to land and do a G/A.
Now lets assume the pilots did everything by the book, which means
a normal loss of an engine can be ruled out since they are well trained for this.
So, this leaves us with the plane for some reason got "unflyable".
We had reports that there were engine problems before the flight,
also that one ore more thrust reversers were deployed on the wreck.
Could it be that one thrust reverser buckets self deployed at rotate
or later?
XPM