You still have not established that the scripture actually says "of the" instead of "to the." Except in the translation you wish to use over all others. There is no phrase in that passage that says either "to" or "of" in Greek. What you translate as "of the" is simply the Greek word for "the".
Which means you don't have a case either, with your "to the jews" vs "to the gentiles," which, by the way, is inherently part of my position.
I'm well aware that "ho" is "the."
The problem with your claim is that, regardless of which it's supposed to be, to or of, or even without either of those words, it still reads as two separate gospels:
"... I have been entrusted with the gospel the uncircumcision, just as Peter the circumcision."
There's a rule called the Granville-Sharp rule, and it applies not just to Greek, but to even the English language as well.
What is the Granville Sharp Rule? What are the implications of the Granville Sharp Rule on Titus 2:13 and 2 Peter 1:1?
www.gotquestions.org
For example:
The father and husband went to the store.
VS
The father and the husband went to the store.
In the first sentence above, there is one person who is both a father and husband who went to the store.
In the second sentence above, while it could be read as a single person, it's not at all likely (in other words, you would have to force the meaning of it to be a single person), and it's normally read as two different people, one of them a father, the other a husband, going to the store.
The same applies to Galatians 2:7:
Paul was given the uncircumcision.
Peter was given the circumcision.
Something else to note is that the word "gospel" is only used once in the verse. It is implied the second time.
Except I pointed out two obvious people groups. Jews and Gentiles.
And?
You will have to take that up with God.
I submit that there's a perfectly valid way to answer the question without having to ask God directly, and it has to do with this very topic.
And that is, that the Twelve preached a different gospel than Paul, and so sending Paul to Israel and the Twelve to the world (as they were originally instructed to go to, by the way), or any combination thereof, would have been counterproductive, especially as they preached two different gospels, Peter and the others the gospel of the Kingdom of Israel, and Paul the gospel of the Grace of God.
But in any case, Paul also preached to the circumcised
At first, he did. Then, later He went ONLY to Gentiles, even saying that he was done going to the Jews because he was fed up with them!
When Silas and Timothy had come from Macedonia, Paul was compelled by the Spirit, and testified to the Jews that Jesus is the Christ.But when they opposed him and blasphemed, he shook his garments and said to them, “Your blood be upon your own heads; I am clean. From now on I will go to the Gentiles.”And he departed from there and entered the house of a certain man named Justus, one who worshiped God, whose house was next door to the synagogue.Then Crispus, the ruler of the synagogue, believed on the Lord with all his household. And many of the Corinthians, hearing, believed and were baptized. - Acts 18:5-8
http://www.biblegateway.com/passage/?search=Acts18:5-8&version=NKJV
and Peter, James and Jude also preached to Gentiles,
There is nothing in the Bible to suggest that Peter, James, and John and the rest ever wrote or went to Gentiles.
sometimes both groups were in the same place,
The only way to arrive at this conclusion is to eisegete it into the text.
Reading your beliefs into scripture is wrong.
and neither changed the gospel according to the particular people group. Peter James and John stayed in Jerusalem---
And they did so against what Christ had told them to do, didn't they.
Or did you forget the Great Commission Christ gave them?
Paul traveled among the Gentiles to spread the word of the good news to the Gentile world. If you know of Paul's personal history that we are given in Acts (mainly), you would even be able to see why he was better equipped than the other apostles to communicate successfully with the Greeks and other Gentiles in the area.
And?