Melchizedek and the Priesthood

We know that Abram's father had left the road of his fathers to become an idol-worshipper.  Therefore, if he had ever had the priesthood of his fathers (which is doubtful) it would have long ago been taken from him (See D&C 121:27.) It stands to reason that, with his desire for the priesthood so great, that Abram would have sought out a man who held the priesthood with honor.  That man was Melchizedek.

 
The Bible tells us that Abram visited the great high priest, Melchizedek later after he returned from Egypt:

And Melchizedek, king of Salem, brought forth bread and wine: and he was the priest of the most high God.  And he blessed him, and said, Blessed be Abram of the most high God, possessor of heaven and earth: And blessed be the most high God, which hath delivered thine enemies into thine hand.  And he gave him tithe of all. (Genesis 14: 18-20)
  
Modern-day revelation indicates what seems to me to be an earlier meeting - before Egypt - because the priesthood of Abraham is mentioned in the context of his visit to Egypt, so he must have received it before the battle of the kings of Genesis 14.  Here is what modern revelation tells me:

Which Abraham received the priesthood from Melchizedek, who received it through the lineage of his fathers, even till Noah; (D&C 84:14)

Joseph Smith wrote:  Abraham says to Melchizedek, I believe all that thou hast taught me concerning the priesthood and the coming of the Son of Man; so Melchizedek ordained Abraham and sent him away.  Abraham rejoiced and said Now I have the priesthood. (Teachings of the Prophet Joseph Smith, p. 322-323)

Brigham Young said: Abraham was faithful to the True God; he overthrew the idols of his father and obtained the priesthood after the order of Melchizedek which is after the Order of the Son of God. (Journal of Discourses 11: 118)

Abraham rejoiced because he had received the key blessing of the fathers, that of priesthood.

Gebara Education 2016