Do you often get the 3 burdens and threats you need? I figure you will need quite a lot of twilight to get the Attea / There Came a Cry combo going, si...
I'd drop 1 copy of Aragorn for an extra copy of Boromir. Boromir is easily *the* most important companion in a Knight deck. Give him a bow and a Banner of Westernesse and you have a healing machine go...
I think you should try to focus your shadow side a little bit. Beeing a threat based besieger shadow you really need more ways to add threats, and since you won't be needing a lot of sites making this...