Fools! Gamon is the Warchief! Garrosh is just a mere puppet, put in place to draw attention away from the new leader of the Horde! With him being the overaggressive meathead he is, noone has questioned this or why Grommash Hold was moved to the Valley of Strength: So Gamon's messengers can carry his orders to Garrosh far quicker. Plus if his political puppet is in danger of being slain by the Alliance, his Awesomeness could descend upon those who challenge his rule and deal with them personally.