Bruce R. McConkie, when discussing General Authorities in the Church, notes that, while they have authority to administer Church affairs, they may not be authorities in doctrine and such a calling does not make one infallible.
Bruce R. McConkie, Mormon Doctrine, 2d ed. (Salt Lake City: Bookcraft, 1966), 284
Though general authorities are authorities in the sense of having power to administer Church affairs, they may or may not be authorities in the sense of doctrinal knowledge, the intricacies of church procedures, or the receipt of the promptings of the Spirit. A call to an administrative position itself adds little knowledge or power of discernment to an individual.