We are thus left with only unlikely - possibly highly unlikely - potential explanations.
There is a difference between human behavior and what is likely and/or unlikely and purely technical things. Human behavior as we know from history of aviation can be so aberrant that anything however unlikely can't be discounted but on the other hand purely technical aspects - here what is likely and unlikely remains pretty much constant and I don't think this particular accident will surprise us a lot in technical aspects (if we ever solve it in its entirety) but human behavior can astonish us again.