Lets think back to the ERA 76 that crashed in the Gulf of Mexico a year or two ago.
Nice night, in cruise flight, very experienced crew, fully kitted out aircraft. Radar traces showed a very shallow descent until about 1500 feet before the radar contact was lost. No radio call...nothing unusual found (that I have heard).
Things happen in our business....some are very complex although seemingly straight forward at first examination.
A second example of why it is best left to the accident investigators rather than hash it out here....the 76 Crash in the Baltic where the hydraulic actuators bound up due to corrosion or whatever it was. That one too was thought to be simple and straight forward.
Bristow/Pan African lost a Bell 412 in Nigeria and no investigation has really been done on that one.
I would suggest holding a discussion of how varied systems function is valid and even discussing causes for spatial disorientation or similar things is also good.
That being said....those discussions have nothing to do with what really happened in this tragedy. As we hear more from the experts doing the investigation then more topics will be subject to discussion.
One man's opinon here.