After doing a quick search most responses to the question of:
"How does flap affect Vmca"
seemed to state that it was aircraft specific. Depending mainly on how it affected airflow over the rudder.
However I was thinking that if the use of flap lowers Vs, and since Vmca must be = or < 1.2 Vs, then it follows that reduced Vs means reduced Vmca with flap.
Is this line of thought correct??