This is all very academic but none of it excuses the fact that certain Air NZ management lied through their damn teeth to the inquiry and tried to cover up anything that might have contributed to the disaster from a company perspective. A random break in at the Collins' residence might be explained away but not the theft of documents, the disappearance of the pages of a manual found at the crash site and numerous other 'odd' occurrences that paint the picture of a company that was scared it would disappear so prevaricated about the facts to try and get out from under. Mahon exposed that and he was the subject of a drawn out campaign to destroy him by those that were affected by his commission.
I echo the previous poster who said "give it a rest" - or re-adjust your tin-foil hat.