Vmca is always higher, in all airplanes
This myth again
There is nothing which requires that Vmca be either smaller or larger than Vmcg. They are the result of different manoeuvres/tests, at rather different aerodynamic conditions. Therefore there is no way you can point at a single factor and draw the conclusion that one or other must be larger.
It doesn't even have to be consistent on a single airframe for two different flap configurations.