barrow, consider the relative airflow generated by the propeller in a power-on stall.
Nothing to do with a wing drop in a stall.
Torque, slipstream and P Factor all spring to mind.
Then why does everyone keep the ball centered to the stall, then wonder why the wing drops!
bingofuel
Yes, but the stall will occur first and provided you recover from the stall the spin will not develop.
In a perfect aeroplane with perfect rigging, flown perfectly in balance with no propellor effects, both wings will stall at the same time and a wing would not drop.
As these conditions will not exist, if you want the aircraft to stall both wings at the same time, I would suggest that the rudder is used to prevent or induce a yaw to try to cause each wing to stall at the same time. To achieve this may well involve the balance ball not being centered but the result is each wing will stall at the same point due to all the variables being equal.
bingofuel gives the right answer, You want to stall and keep the wings level throughout recovery, don't center the ball, less right rudder and a slip is needed.
Ailerons are used for roll control and rudder for yaw. Using rudder alone to keep wings level during entry is poor form.