Sorry, but I have to go with Beagle here. Walter's theory, however plausible, will never be resolved (just as the FADEC discussion is at stalemate). The problem is that even if everyone categorically states the PRC112 scenario didn't not occur, there will be conspiracy theorists who offer that dark forces are at play hiding the 'facts'. No different to the JFK Grassy Knoll or whether Neil Armstrong actually set foot on the Moon.
FWIW, I believe that the LZ scenario did not happen; in fact I'm pretty sure of it. But how does one prove something that never occurred?