I am in awe of those posting here who clearly have fantastic technical knowledge and also fantastic knowledge of aerodynamics, but one thought keeps coming back to me as I read these fascinating pages with the story unfolding ever so slowly.
That thought is a piece of advice I have been giving out for years:
"If ever you get to 10° NU (or more) in a transport aeroplane - other than on take off (or G/A) - you are doing something badly wrong."
There will probably be those who will now post to prove me wrong, but it has always worked for me (eg forgotten the flaps etc). It might have helped these unfortunate pilots who were confronted with a mystifying set of circumstances. We shall see in the fullness of time.