Well obviously no one knows... or very few people know (I still think that there are a couple original bitcoiners on this forum who are 99% sure that they know who Satoshi is).
Whats your favourite theory?
Mine is that it was John Nash

Please provide some proof for your theories. Would love to look into them!
Well one thing I am certain of is that he is either dead or he lost the private keys to his wallets, its inconceivable that every single wallet identified as his has never had a single satoshi transferred since he disappeared.
Going with the theory that he is dead the most obvious answer is Hal Finney.
Going on the theory Satoshi is still alive, Satoshi most likely stopped communicating when they seen Bitcoin really starting to take off, and moving any of the tokens people associate with the creator would be risky because i'm sure they would love those private keys, if they do exists still and weren't destroyed. The anonymity of Satoshi is key to their survival, or else i'm sure they would be public lol
That's just my two cents!
I don't really have any links to any articles on a theory to post but I love this whole topic and the conversation behind it!