Sorry SFP .. I disagree strongly ..
No-one knows, and probably no-one will ever know .. exactly what happened ... everything .. be it formal or informal .. is some form of conjecture. Some from well known, and possibly proveable information, the rest from speculation.
The whole purpose and thrust of the thread and campaign is to remove the slur on the characters of the pilots....
The rules in play at the time .. and the rules of common decency .... do not allow speculation and conjecture to form proof of anything .. least of all "Gross Negligence"