Much as I hate to add to all this, I am looking at a DFDR Service Report (readout) for a 737 CL that shows control column position, control wheel position, rudder pedal position and the positions of the control surfaces connected to these devices. No reason to think an NG wouldn't be recording the same.
(Please note, I am not speculating as to the cause of this tragedy, just the comments about technical aspects of the 737).