Hagar is Sarah's ego just as Ishmael is Isaacs ego just as Pharoah is Moses ego just as Saul is Pauls ego just as Simon is Peters ego just as Esau is Jacobs ego just as Saul who was from Benjamin was overcome by one from Judah/David who is chosen by God to be the way the Messiah comes........through the Jew, through Judah
everything in the Bible is about US in story after story after story and discerning how it all happens within helps us when we are already seated with Christ in heavenly places (which is David in us, the flesh of Jesus or the heart of Jesus)
remember, Jesus said I AM the root (CHRIST) and OFFSPRING of David (heart after Gods own heart) and the bright and Morning Star (Adam)
who becomes David who becomes Christ who becomes Jesus
