Dear caz
If I may say, you sound like someone who is clutching at straws. If something is possible, it doesn't automatically mean that the opposite is probable (from where did you get that!? Goodness me!)
It just means that either altnerative cannot be discounted. I think that others have said more eloquently than I that if this is true (you cannot argue either way), then it is not logical to favour one argument over another without irrefutable proof. Without a CVR/ADR we end up in cyclical discussion, rapidly chasing one's own tail. Ergo, by the MODs own rules, one cannot determine the actions of the crew of ZD576 as negligence.
C'mon wake up and smell the coffee!
I know a nice Professor by the name of Reason who could offer you a fine cup of eye-opening stimulant!