Garath was the Captain-General, Gawyn was to be the First Prince of the Sword, his superior. There is a difference. Several times there is talk about how the lack of a FP hurt Morgases. Galad was the one that would be forced to go out and find his way in the world, Gawyn always had a place, but he found something that was more important to him than that place (Egwene) but couldn't figure out how to reconcile everyting, and ended up lost.