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There is zero chance that a whole team and management above them would have been able to keep this secret for this long with this much attention on it. And there is no reason to believe a single person could not do the things Satoshi did.

Even a single person would have continued communication as Satoshi if they were able to, as their life's work became an incredible success. No, Satoshi was a single person who is no longer able to communicate because they are dead. And there are several good candidates who meet that description.

Personally I'm a fan of the "butler did it" theory, i.e. Hal Finney, who indeed died at the right time.