Has pilot incapacitation been mentioned earlier? Heart, stroke, whatever? Apologies if it has already been mentioned and ruled out
Autopsy make no mention of heart attack or stroke.
I can tell you from experience you can be incapacitated with out heart attack or stroke. I was incapacitated once and after it was all over I passed a thorough medical with nothing wrong.
I had a panic attack and was unable to do simple things like work out which way to go and was not even able to pull the transmit button. Hyper ventilating and tunnel vision with black spots in your vision, absolutely scared shi#le55 what will happen next.
On another occasion I was returning to base with the fuel light on and I was very relieved when I made it with out the donk quitting. (silly I know).
I could well imagine this happening to someone when the fuel light is on and flying at night over a city and not knowing if he will make it back.
In this condition, no way would he be able to work things out, like correct switching and perform an auto rotation.