Don't you see what happened there? They loosed themselves from taking the kingdom gospel to all nations and gave to Paul the right hand of fellowship to take the gospel of THE GRACE that was given to him (the gospel of the GRACE OF GOD) to the Gentiles. What was bound in earth was bound in heaven, and what was loosed in earth was loosed in heaven. They took their Christ given commission to the CIRCUMCISION ONLY. According to Galatians. And Paul went to the Gentiles with the gospel of the uncircumcision (Gal. 2:7), with their blessings, and their asking Paul only that we (Paul and Barnabas) would remember the poor.
If you could show me from Scripture where any of the 12 went outside the Jewish land to preach to all nations, please do.
Their commission depended on Israel accepting Christ as Messiah, whereby they would spread the gospel to all mankind. But that did not happen and by Acts 28, Israel is blinded and set aside. Peter and the 11 had marching orders by Christ to preach the kingdom gospel to Israel FIRST. Until Paul was saved, and given a new commission, which is found in 2 Cor. 5:14-21, and which is our marching orders for this age of grace.