I heard in the radio, that the plane was without many major systems for three minutes before the crash according to the aircraft telemetry. I can't find much more about this, including internet links, but it sounds more strange now.
I can't say yet, which subsystems failed, how long each was offline and why this caused the crash. But it sounds more like a chain of unfortunate events, than just a single lightning strike. It would also be important to know which antenna system they use for transmitting the telemetry, if it was over satellite (SATCOM), the reception of such data would mean that the flight attitude was still fairly level.
Loss of cabin pressure is another one. If this event was really true (and not reported by the system because of a failed sensor), a lightning, regardless how powerful, would be ruled out. While a strong lightning can destroy parts of the wings and control surfaces, it should not blow holes into the cabin. And a power failure alone would never vent the cabin pressure (It would cause a slow decrease if the A/C compressor failed)