Surely how it hit the water, and what caused the damage seen is really of little matter.
It may or may not indicate if there was any control at the time it hit the water, but again, that won't help find the cause.
What is needed is the reason that caused the loss of control (not pointing to pilot involvement or not) at some 30k feet above the damage being looked at.
Maybe this is why they are not too worried about the "hacking up" of the wreckage?