Proprietary code and one single country controlling all the nodes on a global decentralized financial network? That doesn't sound about right and contradicts itself by the way. I don't know how the NSA would have arranged for a lot of nodes to be set up in multiple locations around the world either. And in the presence of China who are probably USA's greatest economic enemies the NSA wouldn't have had the resources to stop a 51% network attack should China have decided to pull the plug on the global network. Ironically China have the most hashing power nowadays and can literally control the fate of Bitcoin. This theory sounds too far-fetched to me, and even if it had a shred of truth and Satoshi Nakamoto was a rouge government agent I guess he wouldn't be among the living right now.
One possible scenario could have been that they wanted to keep the code proprietary and that they wanted to control all the nodes. <Like these Private Blockchain fools are trying to implement Bitcoin> They would then have full control over the decentralized network and also over the code that are being used. {Their goal for a decentralized, privately owned financial network could have been improved security.}
Fortunately the source code could have been leaked prior to it being implemented, because the person saw the dangers in having a digital version of Fiat currencies and then people started to run their own nodes, making it unstoppable.
You got to think outside of the box, when you come up with wild theories like this.