Airtren
You seem to be chasing after a barrel full of red herrings. There is no evidence to indicate that the right and left displays were showing different information (which is what you seem to be implying - apologies if I am wrong in attributing this meaning to your post). The aircrew following proper scan procedures including the artificial horizon would have been rapidly appraised of the situation. In fact there are implications that the PNF did have some clue but didn't take any action. The PF did not perform a proper scan which suggests psychological issues and training issues. If the crew had followed SOPs, CRM and the procedure for UAS this accident wouldn't have happened. This is a training and CRM issue nothing else. I take it you have flown at night using instruments? If so you will know exactly what I am talking about when I talk about instrument flying.