I was just thinking about this the other day.
I believe the Flag bearer should have more support skills or even offensive shouts
like to motivate the brothers for a turn or two and/or debuff enemies around you
“Fight the pain” – targeted brother ignore temp injuries for a turn / removes debuff like stun or stagger
“Take cover/watch out/get down” – shout out to a brother for +def and/or immune to stun/stagger/daze
“Battlecry” – force a resolve check on an enemy (or aoe)
“Shield Wall” – all brothers within 4 tiles with a shield uses shield wall for 50% normal fatigue and no AP
“Charge” – gives a targeted brother extra AP (will not go over max)