I'm from Castille and I agree it's quite sad Aragon would be left out, especially since it was much more important a faction at that time than many others in Europe.
Has anyone heard of the story of the kick-ass almogavars? The fact that the King of Aragon was pretty much king of the Mediterranean sea? he owned Sicily and in this background is when the actual mafia came to being.
On top of that, making Aragon a dull bunch of rebel punks wouldn't be historically great, since the Reconquista was one of the major events at that time, the prelude of the Spanish Empire that would come afterwards.
I'm just lobbying for Aragón spanish motherf.....just as castilians are