Dan Vogel, in a letter to Wesley P. Walters concerning the Adam-God theory, argues Brigham used "revelation" in many different senses, including repeating teachings he learned from Joseph.
Dan Vogel, letter to Wesley P. Walters, August 23, 1979, 2-3, Special Collections, University of Utah
What I object mostly is to the dilemma which you create by citing Brigham Young's words in the Deseret News. Your claim is that Brigham Young received his information by "revelation from God," or at least he claimed he did. This I believe cannot be supported by the reference you have given. Let me demonstrate.
By adding a few more words to your brief quote for context, your reference now read:
How much belief exists in the mind of the Latter-day Saints in regard to one particular doctrine which I revealed unto them, and which God revealed to me--namely that Adam is our Father and God . . . I could not find any man on earth who could tell me this, although it is one of the simplest things in the world, until I met and talked with Joseph Smith.
Notice how the context reveals Brigham Young's unique use of the term "revelation"; he is here definitely equating revelation with what Joseph Smith had told him. And in another place he is reported as saying: "What I have received from the Lord, I have received by Joseph Smith . . ." (Journal of Discourses, vol. 6, p. 279). This is what I mean when I say that you must be careful of semantics when dealing with Mormon literature. Thus, in a special sense, there were two sources of "revelation" for Brigham Young--the Prophet Joseph Smith and the Lord (This idea was brought out in Turner's thesis, see p. 48.) Concerning this dual concept of revelation, Brigham Young explained:
From the first time I saw the Prophet Joseph I never lost a word that came from hm . . . I did hearken to the words of Joseph, and treasured them up in my heart, laid them away, . . . and this is the key that I hold to-day. I was anxious to learn from Joseph and the spirit of God. (Deseret News, June 6, 1877, p. 274; as quoted in Turner, p. 48)
And in another sermon, Brigham Young explained his unique way of using the term "revelation" to the saints, saying:
. . . If the Lord requires anything of this people, and speaks through me, I will tell them of it; but if He does not, still we all live by the principle of revelation. who reveals? Every body around us; we learn of each other. I have something which you have not, and you have something which I have not; I reveal what I have to you, and you reveal what you have to me. I believe that we are revelators to each other . . . (Journal of Discourses, vol. 3, p. 209)
Brigham Young's statement that "I reveal what I have to you, and you reveal what you have to me," helps us to make sence of the remark in our initial reference: " . . . one particular doctrine which I revealed unto them, and which God revealed to me . . ."
We must thus be very careful not to put our own definition to the words of other men, especially those who lived in a time very different than our own. Grant you, all men do not define all their words, but most will define the unusual terms and those which they use outside the ordinary usage. However, it may be, we are fortunate that in this case Brigham Young did define his terms.