I think that, in an around about way, we are talking the same talk ..
(a) however, asymmetric stall (with a bunch of thrust) = recipe for disaster ... so we don't go there.
(b) if Vmca directional problems become limiting at speeds above stall, then that is the Vmca declared
(c) if the flight test program has established that stall speed is higher than the conventional Vmca limit, then Vmca becomes irrelevant