The finding of the BOI, including the remarks of the AOC and AOC in C, will be an administrative finding.
While I am sure that you speak with authority, cazatou, let us be under no illusions. The 'finding' by Messrs Wratten and Day that both pilots had been grossly negligent was as devastating to their professional reputations as a conviction of manslaughter in any 'Formal Legal Action', had they survived. However, with no proof I fail to see how any such conviction would have carried, though no such limitation it would seem is allowed to stand in the way of an 'administrative finding'!