I asked a question at #238.
I've had one answer.
If, and I think that it is a big if, the cargo shifted, how did the aircraft ever get nose-down? At the top of the climb, no control inputs would help, other than closing throttles - but that would be trivial at that point.
How could an aircraft do what this one did with a massively aft cofg? My feeling is that as soon as the excessive pitch up, the crew had no options.
What could the crew tell the ap to do that it could fail to do with I/O failures?
So I can't believe that the load shifted. It hit the ground nose down. I was so convinced that I've flown a couple of models this afternoon with serious aft cg. Nose down? No chance.