I hope this post will clarify some of your questions.
Legends of the Patriarchs and Prophets and other Old Testament…
By Sabine Baring-Gould
Esau and Jacob
“The Cabalists say that the soul of Esau, whom the Arabs call Ais, passed into the body of Jesus Christ by metempsychosis, and that Jesus and Esau are one.”
From the Bible we know that the first Essa / Jesus, was the first born and beloved son of Isaac (Genesis 25) and son in law of Ishmael (Genesis 36).
By Arabs, (in Quran) he is called Essa, while Christ is always called Essa son of Mary.
Esau / Edom was the true carrier of Abrahamic religion.
Genesis 36 tells us that the first born son of Esau and Adah, the Hittite, was named Eliphaz.
Eliphaz was the carrier of knowledge of Abrahamic religion and of the blessing.