Can mysticism or spirituality be transmitted from one person to another? I suggest yes and no.
And, what many may not know, there were many "Christs" who came prior to Jesus, and who were not Jesus, nor do I think they were prefiguring or foreshadowing Jesus. They were the "Christs" in their own right, who came in their own time, who developed what it meant to be a "Christ" or "Messiah" in ancient Israel long before the word was ever applied to Jesus. I think it may be helpful to become acquainted with these "Christs/Messiahs" to better understand who Jesus was.
I perceive that priesthood was originally an inner experience of Divine Power and Presence in humans, a deep Realization when they subdued their egoic psychological "natural man" self in consciousness, and perceived their real Being underneath it in Glory, beyond words. I believe humans eventually organized this mystical experience, and the knowledge of it, instituting it into the "ordination" to an "office" of "priesthood," meant to indicate those who had direct experience of God.
An addition to the BHT, about the problems with religious authorities.