Jeez! Why do all the theories have to be to most complex and least probable?
Look at the simplest reason for loss of control and you'll "probably" have the "right" answer.
All this
about somatogravic xyz or flap fail/fuel imbalance (certain balls) is all very well The most likely cause is quite simply overpitching due to a mishandled g/s and botched recovery, I'd be astonished if it were anything else.
if it looks like a duck, quacks like a duck....