This is a guy who was known to hire body doubles and he had numerous passports.
Given the current state of Russia, almost all of the (conspiracy) theories are currently not completely impossible and nothing can be said with certainty.
Russian politics is a bit like watching a couple of pitbulls fighting under a carpet. You can certainly see movement, and hear that something is happening, but you don’t really know what happened till you see the bones of the loser tossed back out.
That was said in the 30s or 40s by Churchill, and I probably butchered the quote, but it leads me to believe that this has been the state of Russia for a long time