If I were to bet on it, I'd bet very heavily on him creating wealth under those circumstances. As measured by creating a system for survival. Obviously not as well as someone trained in such things (as implied by your dodge), but better than someone who lacked his intelligence, and more importantly, his drive.
Ordinary people are compensated ordinarily because their contributions to the economy are ordinary. That actually does seem quite fair to me. I appreciate the work cleaners do, but their jobs simply don't contribute to the economy as much as building a large company like Facebook does.
That's not to say everyone who is highly compensated contributes highly to society, we all know that isn't true. But that's also not really what we're discussing.