Nah, it would be more like 21 new ones. If we could only get those strat map army banners and strat map characters/models to change - oh man, that'd be awesome! It really does feel more realistic when you are fighting groups like this. I had a battle a few days ago when two rebel armies attacked me. They both showed up at the same time, and they were two different rebel subfactions. It was like a custom battle, but it was definitely in an imperial campaign - the "thracians" were attacking me on one side with their blue banners and gold eagles, and a subfaction of gauls were attacking me on the other side, with their brown and green hound banners, and both sides having different types of units. It was very cool indeed. So much better than having two generic barbarian banner armies coming at me.