Dozy
The evidence is yelling at you.....No one sussed the PF Stick movements....If they had,,,, etc,.etc,,,,,,
There is another even more troubling possibility....Let's say that the SS performance is "as designed", no problemo.....The Sticks were visible, the actions noted, and.....
There was no response to Recovery solutions? This is the most obvious, had the sticks been merely "one design of two, and I don't have a preference, one way or t'other....",
Something broke, something was wack, and three pilots despite their best efforts, could not recover from STALL, LOC, and jet upset. I need to suggest again that something is missing, inadvertent, or deliberate, from the data.
And the a/c was unrecoverable, as equipped.....