Could that really be true, that the founder worked with no one else in this life long invention? That we’ve not had anyone come up to point to us whom the persona is doesn’t mean the truth behind the 8th wonder of the world in the Satoshi Nakamoto isn’t known by some one or some group. It’s just that, the persona have been on top of his/her/their game and had a deep understanding of what they did intend to archive. That’s how I would like to imagine it.
Satoshi Nakamoto, as a cypherpunk, knew how important privacy is. I am not saying that Satoshi Nakamoto implemented Bitcoin alone, nor that he never interacted with other people. In fact, there are multiple emails where Satoshi Nakamoto exchanged ideas and thoughts with a lot of people. They also had an account in this forum, where he interacted with a lot of users. But, what I am saying is, nobody knew who they were in real life.
If I had a guess, I would speculate that Satoshi Nakamoto and other cypherpunks cooperated in Bitcoin's development. The result (Bitcoin) isn't perfect, but it feels like the creator has thought every single detail. My experience with programming so far has tought me that 2 pairs of eyes is always better than a single pair. Having said that, my guess would be that Satoshi Nakamoto is just one of the people who worked in Bitcoin.