Quoth takata:
b) A power supply failure after 0214:28 could have stopped the ACARS transmission. Consequently, the crash time canot be acertained from the end of ACARS alone.
One can infer, however, that until the end of the ACARS transmissions less about 10 seconds or less the VS was still attached. Therefore one can also infer that a VS detachment did not doom the plane as it was already doomed at the earliest possible time for its departure form the plane.
That, in itself, says a lot, I believe.