Regarding Sansa’s marriage, wasn’t it a bit premature? Whatever schemes Tywin had cooking, Robb was still in the field with an army and as yet undefeated. What if the Red Wedding failed, and he mauled the Lannisters some more, to the point where Tywin has to sue for peace? They can’t trade her back for concessions, esp if Tyrion had consummated per orders. What would Robb be able to do about it and what would society view as a reasonable position on his part?