There is far more to be reported by this investigation and there are far more questions than answers right now despite all of the conventional wisdom that flows here at pprune.
The legal questions shall be far more complex than the explanation of what caused the aircraft to crash. There are multiple layers of responsibility and multiple layers of actions along with the law and air regulations that will have to be sorted out before the full story comes to light.
Laying blame at any one's door step and saying they were the cause is very premature at this point.
Seventeen People died, one is critically injured.....let's look for lessons learned to begin with and see if we can find solutions to those problems while we wait for the official answer to how this happened.
Have we posted the Authorized Emergency Procedures (in effect at the time of the crash) for the MGB Loss of Pressure and Loss of Lubrication Fluid situation?