Ituttut
I have proven nothing OldRegular, for it is scripture that proves there are Two Gospels.
The verses say what they say, and that is the Gentiles fitly framed together with the Jew, and will grow into a holy temple in the Lord. Notice it Will Grow Unto.
Paul does not try to take away from what was shown the Apostles appointed by Jesus while He was on earth, but Paul is also an Apostle appointed by Christ Jesus. So Paul here as in other places tells us something we didn't know before, doesn't he?
Paul tells us he would not lay a foundation on another man's foundation, which he lays on the foundation of Jesus Christ. There is a purpose for this, and it is to show that we justified through faith will fit firmly together with those justified by faith "unto an holy temple in the Lord".
Don't you find it interesting that Peter says they can NOW be saved just as we Gentiles? Nowhere can we find in the Bible (other than proselytization) that we today are to be justified by faith.