Why not Speculate Donut King ???
Speculation here will not influence a BOI or investigation. In terms of professionalism it is entirely professional, IMHO, to hypothesise about these cases; it can be very educational and may even prevent an occurrance in the future.
There is an age old tradition in aviation of going over situations informally, either in the crew room or the bar, why not continue it here?
As long as there is no finger pointing or disrespect I see problem.
Gibbo