Even if Egane were the leader of the highest ranked warriors, whether he's there right this second or not is another matter. Yaremaha is heading back to the borders to man the defenses there, but, obviously someone is still there. Even if it's the Glow's birthday or whatever it was, they can't exactly pull all of their military from their posts. Especially the areas they only just got in that little war a while back. Perhaps this all went down while Yaremaha was the only one of those military leaders who was able to be present.