The East and West '62 campaigns are good, but they are significantly longer and when each person plays as north and then south, one round would take longer than an entire battle scenario tournament. And having 3 battle scenarios lends itself well to a 3 tiered competition.
The scenarios may well be unbalanced for resources, but so was the situation. The balance for the purpose of the tournament, would be that each person plays as both north and south, with overall victory based on the outcome of both of these matches. With the recruitment factor removed, each competitor would have the same troops/resources with which to use to the best of his ability.