I think i have already agreed with you that 'initially' the kingdom was offered to those of Jewish ancestry so of course I agree with that.
Daniels prophecy testifies to that fact at Daniel 9:24-27
“There are seventy weeks that have been determined upon your people and upon your holy city, in order to terminate the transgression, and to finish off sin, and to make atonement for error... And you should know and have the insight that from the going forth of the word to restore and to rebuild Jerusalem until Messiah the Leader, there will be seven weeks, also sixty-two weeks. ... And after the sixty-two weeks Messiah will be cut off, with nothing for himself. And the city and the holy place the people of a leader that is coming will bring to their ruin.... And he must keep the covenant in force for the many for one week; and at the half of the week he will cause sacrifice and gift offering to cease."
The covenant was 'kept in force for the many (jews) for one week'.... the Jews were the ones for whom the covenant was 'kept in force' which meant that they were given the first opportunity to take a seat in the Messiahs kingdom. Hence why Jesus said he was only to preach to the Jews. This 'half week' went on for the full 3 years of Jesus ministry...it ended at Pentecost 50 days after his death.
However, 'at the half of the week' he caused sacrifice and gift offering to cease when he presented the value of his sacrifice to God in heaven and God accepted his sacrifice by pouring out the holy spirit at Pentecost. From that point on there was neither 'jew nor gentile' for all people could take part in rendering God a sacred service in the way that the priesthood had rendered sacred service to God at the temple in jerusalem.
So really, the gospel of Grace that Paul taught was mentioned in the OT, it just wasnt understood until the time that God made it understood. Abraham knew that 'ALL' nations would be blessed by the seed, the Messiah certainly knew it for he spoke to a samaritan woman about it and he also told the criminal beside him that he would be in paradise...so obviously Jesus knew what was going on at that time....its just that the covenant was kept in place for the jews to be given first opportunity. And Peter was sent to the gentiles before Paul was, so obviously after Pentecost the apostles had it revealed to them that the gentiles were to be included in the kingdom covenant and they acted in harmony with that revelation by baptizing gentiles.
Except for your summation we agree.
