See your point john, I was looking from a more general certification perspective in so much as certain items mentioned are taken for granted e.g. cert is done with aft CG, max thrust, no x-wind, NWS inop, etc. In these circumstances I imagine that VMCG will always be higher than VMCA, due to the arm issues mentioned earlier, and the 5 deg allowable (i think) bank. Adjusting the speeds for all of the variables possible may result in a situ where it is VMCA which is higher, though I would imagine that would be rare. As an aside, I must admit I was shocked to see a V1 of 117 kts (VMCG limited) when we started doing derate t/o on the -400. Mind you the N1 is only about 80%, so it all makes sense, but still a pretty low commit speed!
This used to be a common interview question a few years ago, but seems to have died off.