It may not be a popular opinion but I've always thought that a cryptographic intelligence agency created bitcoin. Or at least, some of the codebase behind it. Especially considering the wealth of knowledge (mathematical, philosophical, economic, cryptographic) required to create such a thing.
The inital commits by Nakamoto were nearing 20,000 lines of clean, precise code. Just doesn't seem reasonable for one person to have done as a pet project over time.