I ' m hoping this is all part of a plan to break Michael out of the cage , which is another reason why he hasn ' t simply killed Rowena . He wants her to think she ' s useful but expendable . Why break Michael out of the cage ? They ' re brothers . Despite being at odds , they care about each other , and Michael being so disillusioned with God ' s plan might even start seeing things from Lucifer ' s perspective . You can ' t up the ante much from The Darkness , but having to deal with the two most powerful ArchAngels comes pretty close . Part of the drama can also come from the fact that , ultimately , the only two vessels that can really hold them indefinitely are Sam Dean . <| sep |> I don ' t know howThey probably won ' t let meI can ' t make undry sandwichesLet alone deliver them to ausland