On that basis no one would ever make a judgement on anything..............!
in circumstances where 'no doubt whatsoever' was the criterion.
One can, however on the balance of probablities, conclude that the defence of the indefensible by a small number of people directly concerned with the lamentable state of airworthiness control is more to do with hoping a cover up will save their reputations than a desire for the truth to emerge.