I probably did not explain this very well. It's late for me and I'm sure I'm not making myself clear. Sorry! :)
Actually, you did great.
You explained that very clearly.
**Paul says there is NOW ONE BAPTISM.**
You’re indicating that Jesus Christ’s commissions (at the end of the gospels) were short lived, as well as his instructions for rebirth to Nicodemas (there is ONE rebirth).
Many regard Paul to be the writer of Hebrews, considered by the experts (whoever thay were) to be written two years after the epistle to the Ephesians, which says “of the ‘doctrine of baptisms”: “and this we will do, if God permit”.
Remember that Paul was reminding born again believers of the gospel, otherwise he wouldn’t be saying in Heb. 6:1-3:
“Therefore LEAVING the principals of the doctrine of Christ, let us GO ON TO PERFECTION, not LAYING AGAIN the FOUNDATION of (1)repentance from dead works, (2)and of faith toward God, (3)Of the doctrine of baptisms, (4)and the laying on of hands, (5)and of resurrection of the dead, (6)and of eternal judgement. And this we will do if God permit.” (added the numbers in parentheses)
So, of the things that I listed numerically, you would only remove the plural ‘s’ from ‘baptisms’?