Without any new evidence, the crash becomes more an exercise in politics, and authority.
Perhaps the bottom line is how much authority (control of evidence) should any entity possess which has a commercial interest in the outcome of their investigation?
DOZY: As a sw boffin, do you expect much of what is needed for an understanding has a particular timeframe?
I think the window around a/p loss, since this is the point at which the vulnerability was highest? If the PILOTS are as described, what is the point in a retrospect of STALL?
How did this START?