Casting out devils is not a priesthood ordinance. Anyone can do this just by raising your right hand (left if you do not have a right hand) and saying "Satan, in the name of Jesus Christ, I command you to depart. We don't say that other Churches and individuals don't have partial truth and opportunities. Not at all. There's a church around our place that works primarily with people who are addicts of drugs and/or alcohol. The do great work and help people with their demons. We've had some of them join with our Church because of the old saying "You are or become who you hang around." We don't promote alcohol, tobacco or drugs and so people trying to stay sober have a better shot with hanging around Latter-day Saints. And, going on to the next covenant of true baptism, gift of the holy ghost, washing and annointings, endowment covenants and sealings of families together. Also, lay work in the Church as well.