How about this then for Brienne's storyline. Faced with the killing of Jaime in order to be true to unCat she kills unCat and becomes the oathbreaker she loathed in Jaime, in order to save him. There'd be a great deal of angst in that decision for our noblest of noble she- And where would we all sit in judgement of her then? Oathbreaker to an evil undead persona, or heroic defender of the reformed?