User blog comment:Tommy,Klaus&Kol2012+/future antagonists/@comment-79.115.71.25-20151206202750/@comment-79.115.71.25-20151207100057

Yes, but probably she is working for another Leader ( could be a higher angel , reaper ) , someone has to take charge ,to give the reapers orders. Probably the one who is in charge now could has somethink against the Winchesters. Maiby Billie do not posed a threat, but a army of reapers would posed a threat.