GG
No, I'm not paranoid. I fully accept that absence of evidence is not evidence of absence: I have used the phrase umpteen times in this forum. The key words in my post were: "where the burden of proof lies in this case."
In fact, proof by the revewing officers that no possible causes other than gross negligence resulted in the tragedy would still have been insufficient to satisfy the burden of proof. They would still have needed to produce definitive evidence of gross negligence by the crew.