This is the my own idea inspirited by Youtube channel of HiveTyrant where they did this quest with mono Leadership and mono Lore deck.
Gloin to soak up some archery damage and brings in resources which are quite important in this quest.
Theodred gives one resources to questing hero, most of the time to Aragon
Aragon, we all know he is a good hero and with Theodred you can always act 2 times per round with him.
Other cards are quite self explanatory, you have some attachments to boost up your will power, defense and from events you have obviously sneak attack and card draw engines to get you cards to the hand