I do not think these words mean what you think they mean.
So?
Maybe, but they are concerned about game balance, which you obviously aren't. And what difference does that make, anyway? Has nothing to do with the AO.
No, because their effect was never tied to era/age at all.
As I said, they are concerned about game balance, so the C-Map was definitely a consideration for them.
Well, you're fighting same age troops in GvG, so it certainly should. I'm pretty sure I've seen it trigger there, but I'm not going to waste time testing it.