I haven't read any individual theory as I find it rather futile, but since he lived in the world of espionage and had lots of classified knowledge, I wouldn't be surprised if an agency (US or otherwise) took him in and faked his death. The same can be said about the opposite, though.
There's no way for a layman to find out either way, but unlike someone else with similar conspiracy theories like Michael Jackson, it does make sense.
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u/_GoddamnitDonut 5h ago
Probably the same reason for Flock execs looking at cameras in children's gyms.