As for Agaricus. The reason 'gross negligence' was rightly overturned was simply because there were many potential causes of this accident.
No it wasn't. It was because the MoD finally accepted that there was no "unequivocal proof". PROOF.
There can be any number of reasons postulated for the accident but to suggest they can all be dismissed as of an equal probability as you seem to imply is simply dishonest.
CFIT is
by far the greatest probability.
All circumstantial evidence points to it. No evidence whatsoever that I am aware of points to or even suggests/implies anything else.