Both Jews and Gentiles were without Christ before He came.
What is ^the commonwealth of Israel^? -> the promise of the Messiah -> the land of Canaan -> the Law
What are ^the covenants of promise^? -> Abrahamic covenant -> Mosaic covenant -> Davidic covenant
So, exactly what were the Gentiles missing as -> only 1 thread of Abraham^s descendants brought forth the Messiah -> Canaan is not a very big part of the earth -> the Law was helpful but burdensome.
What hope did the ChildrenOfIsrael have that Gentiles didn^t?
The ChildrenOfIsrael did not ^have the HolySpirit^. Different individuals had experiences with the HolySpirit but He was not an abiding presence in them.
My point is that Paul saw being a Jew as somehow or other more blessed than being a Gentile despite the fact that there is no concrete historical evidence to support that feeling -> grandeur of Egypt -> grandeur of Babylon -> grandeur of Persia -> grandeur of Greece -> grandeur of Rome
The Jewish fixation on being ^chosen^ (which is the persepective from which Paul is speaking) is a problem for them as it is still holding them back from receiving Christ who revealed that God loves the WORLD - not just Jews.
As believers, we know that those who choose Christ are chosen by Him.