Colossal: initiator
Taunt: Tank
Twin blade: DPS

Situationals:

13:
-Juggernaut (if no annoying healers or shielders)
-Mortal strike against team with a lot of Healing --> good with Twin blade or Colossal
-Shattering throw against heavy shields (T***ador, Artanis, Zarya, etc)

16:
-Banner of stormwind when low team mobility
-Banner of Ironforge for armor***
-Banner of Dalaran if a lot of mages in team & can boost COLOSSAL

20:
-Colossal upgrade not Worth
-Glory of the alliance: good if AOE Healing
-Demoralizing Shout: also very good, synergy with bannor of ironforge