You really cant just rely on autobalancing, and a single person will rarely make a difference in 120 man battles, unless one decides to command, (take phazh for example), with some tactics and commanding one team can win round after round no matter what odds they are against ( i remember a 35v80 random battle with mercs, we kept winning for almost 2 hours).
Yeah obviously not everyone will listen, but sooner or later after some good battles people will cooperate more and remember you.