Maybe I can simplify my question. In cruise your airspeed on one side suddenly drops to 100 knots indicated. Does the stick shaker kick in if the alpha vane is not sensing a stall?
YES and you will also have SPD DISAGREE .
The stick shaker will activate as the speed displayed is the speed used by the SMYD and it is the SMYD that sends the stall warning to the control column.
The AOA is NOT used for the such speed floor stall warning.(low speed).
If the AOA reaches its critical point,the SMYD will send the same signal(stick shaker) AND the EFSM will increase eletor down force with an increase in hydr A pressure.