Christ is God's elect. And notice how election is tied to service not salvation.
Isaiah 42:1 Behold my servant, whom I uphold; mine elect, in whom my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles.
i agree with you, Christ is referred to as “mine elect” in this messianic prophecy, however, it is used over 50 times in the OT and the NT referring to the seed of Jacob.
When God called Abraham and made the unconditional promises to him, he also revealed the gospel. God was to carry out a plan choosing one man, regenerating his wifes womb which supernaturally brought forth Isaac whereby “the seed of promise” began with Jacob.
God didnt just promise to make one nation, bringing forth generations of offspring of whom a messiah would one day come; offering salvation and eternal life. He promised these offspring would become many nations, they would be innumerable and inherit the world.
This plan over many generations was accomplished, God did make many nations of these offspring and sent them a saviour who did confirm these promises being accomplished. the seed of promise received the gospel and God has built them into the mightiest nations the world has ever known.
This in stark contrast to every nation who rejected the gospel, 2000 years later and they are still sitting sand, overpopulated and confined to famines, pestilence and poverty; running around in jungles chanting to their false gods; subjugated by dictators, tyrants, oligarchs and imams.
Its absolutely stunning what God has done in over 3,500 years of prophecy and with little left to be fulfilled, we are living in an amazing time