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The patient has been cleared.
I'm not sure about Alex being Li because I like both possible solutions to the clue, and Sesame seems more suspicious to me. I admit that I might have been wrong about Doug, and Uran may not be recruited. Vishmaster seemed to have some other roles as well, and Snowman only seems negative based on his behavior, absence in the newspapers, and Doug's words. I'm not 100% sure about anything.
Clue about Sesame:
Here's another option:
Conan - Robert Howard - Cthulhu Myths - Mu (Pacifida) - Easter Island - Miklouho-Maclay - Johor Bahru - Johor - Singapore