FH1100. A very thoughtful post.
Your comments describe precisely what bothers me about this accident : I'm struggling to figure out what on earth can have been going on in that cockpit and more importantly in the mind of an experienced and evidently, in normal circumstances, entirely competent pilot, over quite a period of time.
As much as anything because of that sneaky horrible feeling ; if it can happen to someone like him, what chance have I got?
Hyds Out ; your description of the likely final sequence makes sense and also makes for dreadful reading/visualisation.
The human factors aspects are what intrigue and puzzle me.