EDIT (different point): Something else I was thinking of, because apparently no one here seems to have been in the military. Let me point out that in the military, even though we all had individual brains, we still marched in-step, turned in-step, and many other things that would make "us" seem like robots/bad animation. So it is entirely possible for individual AI AND doing the same troop movements. I suggest looking at some of the battle scenes in LOTR when it is displaying real people and watch how when someone is motivating troops, many people do the same movement (e.g. cheering).