Good analysis. But is it a distinction without a difference? In canon law and Scots law, subreption is the obtainment of a dispensation or gift by concealment of the truth, whereas obreption is the obtainment of a dispensation or gift by fraud. - Mirriam-Webster
To give it a better "distinction without a difference" fit, I guess I could have worded it this way:
“Obreption” does not mean “subreption”, just like “Hillary” does not mean “Hellbound”.(And Hillary could also be referred to as "the obstreperous one", although I guess that is really neither here nor there...)