I will try to be a bit sensitive here as I know this thread will attract people who have lost loved ones on the Silk Air flight and that is why I have avoided this question on the other silk air threads.
As this is a tech thread here goes.
If the stab trim was fully nose down, and the CC fully forward, why didn't the aircraft do an outside loop? In other words, it would go in the vertical plane, then through the vertical plane.
Surely to achieve the aim of hitting the ground, once the nose was pointing downwards, the stab trim would have been wound back and the CC centralised?