It "appears" that way because that's what it is. You have to "study" your why out of it being what it plainly says.
Is what Paul preached after this in Acts 13 the gospel he was given?
Again, why the need to send for Paul?
For that matter, why was there a need for another Apostle at all?
Matthew 19:28 And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
Acts 2:14 But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words:
Revelation 21:14 And the wall of the city had twelve foundations, and in them the names of the twelve apostles of the Lamb.
I submit to you that you are in rebellion to Paul's distinct Apostleship; message; and ministry because your study approach is off, and as a result, has not allowed you to see the obvious.
One could say in your case that the path to ignorance on this issue is paved with good, but failed...intentions.
Again, I believe you mean well and are actually after the truth of a thing.
But your study approach is flawed in places.
Rom. 5: 6-8.