Even if I am obliged to concede this great point to Dubourg, I don't like to follow from this conclusion the his implication that the entire package "Paul + epistles" were invented by the same people who invented midrashically the name Paul from the Saul story in 1 Samuel.
It is evident to me that the people who invented midrashically the name Paul from the Saul story in 1 Samuel are the same people behind Acts of Apostles: merely proto-Catholics.
In other terms, epistles existed before, and only after "Paul" was added to the epistles by proto-Catholics just as the connection Paul/Saul (really, it is the same connection).
The epistles existing before fit better the scenario argued by Stuart: a set of various fragments collected from here and there, and connected forcibly to the name of some patron.
Now, Marcion couldn't adore Paul (the presumed author of this corpus of epistles) as 'Paul', since the entire Paul idea is midrash from the OT Saul, a late catholic invention.
Hence, three options, mutually exclusive:
- Marcion had Simon Magus as the fictitious author of the his (=of Marcion) collected 'epistles'
- Marcion had another name, both different from Simon Magus and different from Paul, as the fictitious author of the his (of Marcion) collected epistles.
- Marcion collected only various fragments from various anonymous (Gnostic) authors. The Catholics, not even Marcion, were the first to show them as the work of a single author, named Paul.