@decurion
While those are perhaps the two derivatives most directly impacting the VMCA balance, it must be remembered that there is a great deal of potential for alpha to affect VMCA (through the effect it has on the various lateral-directional derivatives) and the kind of question that always seems to be posed about VMCA tends to refer to AIRSPEED at different flap settings - and the same airspeed will of course have different alpha for different flaps.
It probably would help the basic aerodynamic understanding if it were considered in terms of the effect of flap at fixed alpha, but that's of course a more theoretical approach.