Mount of Transfiguration

This week I read the different accounts of what happened on the Mount of Transfiguration. I noticed something I hadn't noticed before. In the account in Matthew, it mentions that Elias and Moses were there, and then in the footnotes it says that Elias was Elijah. However, in the account in Mark it mentions Elias and Moses and then the Joseph Smith Translation adds "or in other words, John the Baptist and Moses." In the account in Luke, it simply mentions Elias and Moses and refers to them several times as "the two men." I had always heard that it was Elijah there, but finding the differences perplexed me. I reached out to a good friend of mine that I trust spiritually and asked him his opinion. Instead of giving it to me he asked a series of questions, in order to help me come to my own conclusion. His first question was: "If we use the restoration as our manifesting template and those critical to restoring keys to latter-day man, who would YOU say must/should have been there?" I answered that if I had to choose one, based on the restoration of keys that happened in the Kirtland temple, I would have to choose Elijah, but that I believed that both could have been there. His next response (this was all happening via text) was: "As far as it is translated correctly." So then I was thinking, well the JST says John the Baptist. He told me to turn to D&C 110. Then he asked, "How many came to Joseph in restoring keys?" I was thinking simply of those mentioned in 110 so I said, "Moses, Elias, and Elijah." In response, he told me that actually we have to consider all who came, so there was John the Baptist to restore the Aaronic Priesthood, Elias, Moses, Elijah, and Peter, James, and John. Then he said that if they were all the major players then, that they would have all been at the Mount too. I could see it then. I remember General Authorities talking about more people being at the Mount that aren't in the scriptural accounts. Then my friend said this, which has given me cause for thought: "The clearest view of such things (particularly when scriptural accounts seem to conflict) is the documented pattern of the Restoration. That is really the grand key to overlay to clarify past dealings." And he's right. If something is being RESTORED, then that means it was in the past as well. Interesting, no?