I'd bet $1 in Nick Szabo.
* a shadowy genius from a Dan Brown novel (like Ensei Tankado from Digital Fortress)
* Nicolas Bourbaki (who was a group of people)
But Le Roux is as smart as a group of mathematicians, and is much more the sort of person who would come up with ultralibertarian solutions like Bitcoin (being, you know, a criminal mastermind and all).
But does that mean he singularly created, or that some secret sharing scheme won't unlock the credentials without all inventors?
No, there's no guarantee that Bitcoin was singularly invented. I'm not even convinced Craig wasn't part of that team. I'm just convinced he's not the singular inventor.