BEagle is correct to say that if a wing drops then moving the stick forward will unstall that wing and prevent any spin.....no stall, no spin.
However, I believe that the emphasis is put on using rudder to stop a wing drop because if the student has a burning desire to use the aileron.
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-273,
The Vmc speed is based on the lowest speed at which the rudder can prevent the yaw caused by the operating engine(s) with the failed engine feathered.
Thus as the aircraft is about to depart, the rudder is at maximum deflection.........it's all about yaw.
If the aircraft is banked 5deg towards the live engine, then the amount of rudder required is reduced....secondary effect of roll is yaw. Yes there is the adverse yaw factor but most modern aircraft have other measures to reduce adverse yaw.
However, if with full rudder and having used the ailerons to bank the aircraft 5 deg towards the live engine, the speed is allowed to reduce below Vmc then the aircraft will yaw (and roll) away from the live engine unless power is reduced...........the apparent wing drop is not as a result of that wing being stalled it is simply the secondary effect of yaw which is roll....and you won't enter a spin unless the wing does stall which depends on how close the stall speed and Vmc are.
So basically, Vmc has nothing to do with wing drop at the stall.
Regards,
DFC