Note that Acts 9:15 are the words of Jesus Christ Himself,
So what?
and the order of His words indeed had meaning
Because you say so?
Considering that the period of time between Paul's conversion in Acts 9 and the time when Paul wrote Romans was about 22 years, and that in the time immediately following his conversion we see Paul ALWAYS beginning with going to the JEWS first, and not the Gentiles first, we can determine that what you say is not the case, the the focus was not primarily (at least not originally) on the Gentiles.
Note that there is only one Gospel
Because you say so?
Paul is NOT saying that there is only one gospel here.
He is talking about the men sent from James who were trying to get Paul's converts to keep the law, where Paul's ministry is ALL ABOUT NOT keeping the law, because the gospel given to Peter, James, and John and the rest of the Twelve was ALL ABOUT KEEPING THE LAW, as Jesus said "
keep My commandments."
Paul's entire ministry is about NOT keeping the law.
Things that are different are not the same.
preached by both Paul and the other Apostles
Jesus and the Twelve: Keep the Law.
Paul: Don't keep the law or you'll be cursed.
Things that are different are not the same.
1&2 Peter were written yet another 9-10 years after Romans, and by that point, Peter had mostly come to accept Paul's ministry as being different, though he still had a hard time comprehending it all (2 Peter 3:16).
You'd think that if Peter and Paul were teaching the same gospel, they wouldn't have ANY disagreements on what to teach, yet they clashed multiple times, with Paul even calling Peter a hypocrite to his face!
You don't do that if you're teaching the same gospel, because there wouldn't be any differences to argue about to begin with!!!
In order to focus on the Gentiles (Romans 11:13).
Seems like a poor allocation of manpower then.
Why originally send 12 people into the world, and then later they go nowhere but stay mostly in Jerusalem and Israel as a whole, but send one person out to the whole world?!
It doesn't make logistical sense at all!
And again, Paul originally went to the Jews, and it was only after THAT that God told him to go to the Gentiles, and even then, if he came across Jews, he went to them first, and then the Gentiles second.
So again, WHY PAUL to the entire world, when God already had 12 capable men to teach, if the gospel is the same?