I personally find the arbitrary concept of a team leader/general being able to use upped cards very unfair. I don't see the point of it in War, and I don't see the point of it anywhere else. They haven't done anything to deserve it inside of the event, and if you're afraid matches won't be varying enough, you have a problem with the entire event that should be solved.
Furthermore, 5 people in a team is very unwieldy. I like 3 better, in that case.