Paul re-baptized because he knew it was for the remission of sins VIA the name of Jesus.How does your view compare with Paul's actions in re-baptizing the disciples of John the Baptist in Acts 19? John's baptism was under the authority of God, right?
Otherwise, he would not have made it into a big deal and left it alone.
We should practice re-baptism in the name of Jesus Christ as Paul did, as needed.
It is just as relevant today as back then.