From John 1:4-13
In Him was life, and the life was the Light of men. The Light shines in the darkness, and the darkness did not comprehend it.............. There was the true Light which, coming into the world, enlightens every man. He was in the world, and the world was made through Him, and the world did not know Him. He came to His own, and those who were His own did not receive Him. But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.
The "as many as received him" include those from evry nation, chosen from among men to become sons, through "implatation of the "seed"(Messiah, the Logos), which translate "anyone" from the darkness into the kingdom of his glorious light. which is Messiah. There was no need to spread the lost tribes out among the nations(not saying it didnt happen) because the "seed" was to be planted by faith in "all" who received him from "every" nation- whether of a lost tribe or not.....earthly heritage(bloodline)having no relationship to the gospel of "glad tidings to all people", which is a covenant certified in a new bloodline- the blood being received through fatih in Jesus, a seed in the womb of the soul that grows up into "sonship" in evryone who retains faith.
Gal 3:26 for ye are all sons of God through the faith in Christ Jesus, for as many as to Christ were baptized did put on Christ; there is not here Jew or Greek, there is not here servant nor freeman, there is not here male and female, for all ye are one in Christ Jesus; and if ye [are] of Christ then of Abraham ye are seed, and according to promise -- heirs(YLT).
Predestination, to the "sons", the "as many as he called to himself", for to "all" those who received him he gave them "the right/authority/privilege to become sons of God, as many as believed in his name."
And we have known that to those loving God all things do work together for good, to those who are called according to purpose(that God be "all in all"); because whom He did foreknow, He also did fore-appoint, conformed to the image of His Son, that he might be first-born among many brethren; and whom He did fore-appoint, these also He did call; and whom He did call, these also He declared righteous; and whom He declared righteous, these also He did glorify(YLT).
This is the importance in Galatians, of Paul's point that the covenant, previously ratified in Abraham, to his "seed"(Christ), could not be pre-empted or over charged by a later covenant ratified in law(earthly Israel), but was rather the superior enforceable covenant, now carried in the spirit unto "all" who believe, earthly bloodline no longer relevant("there is not here Jew or Greek").
in order that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we would receive the promise of the Spirit through faith.
Now the promises were spoken to Abraham and to his seed. He does not say, "And to seeds," as referring to many, but rather to one, "And to your seed," that is, Christ. What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise. For if the inheritance is based on law, it is no longer based on a promise; but God has granted it to Abraham by means of a promise.
And have put on the new man, which is renewed in knowledge after the image of him that created him:
Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.