In all the shaking, rolling, whistles and gongs, could the Pilot Monitoring possibly not realize the PF was holding aft stick? Could the PM, if in the right seat, override or at least neutralize the PF holding aft stick if he did know what the PF was doing?
To clarify ... if I am in RH seat, I move side stick, LH seat side stick does not move. Do I have that right, or wrong? Block diagram (old) suggests to me that would be the case.
That is correct. In the aircraft you cannot see what stick command the other pilot is giving, and the other stick does not move in any way (unless you move it yourself). The only way to cross check is by monitoring the performance of the aircraft.