Walter .. the whole of your diatribe above is pointless in the context of this thread.
.....that surely clears the pilots of blame
It is not necessary to show any reasoning as to why/what/where or any other of your fantasies.
The Pilots can and must be cleared of blame (as you put it) for one simple reason - and simplicity seems to be lost by many folks - and I capitalise this on purpose.
THERE IS NO PROOF OF WRONG DOING, NO EVIDENCE TO SUBSTANTIATE AN ERROR, THE CAUSE IS, AND REMAINS, UNKNOWN.
Therefore the Pilots cannot be blamed because NO ONE KNOWS WHAT HAPPENED
Simple. End of.