It is indeed hard to take so many in game abilities as completely legit and that is why I usually talk using what I see. In the situation in the throne room it is clear that the advantage in both numbers, fatique, morale and powers are in the side of the Alliance. It's one of the reasons noone of the Horde leaders dared to retort to Varian Wrynn's monologue. He just gave them an ultimanum, a last chance and noone of the Horde leaders said anything because they knew that they were in a disadvantage.