The question raised by the original accident analysis thread could maybe be restated as a question regarding the correlation of accidents/incidents with training agency, and thus not be locked by a moderator? I agree with locking that thread, so I'm not trying to reopen it here.
We've all heard PADI bad-mouthed, but is it true? show me the data. Is there any data? And is there any data for cave training agencies that correlates with accidents/incidents? I would think that the numbers would be pretty much the same across training, and from surveys I've done for other reasons we've found that cavern and cave divers typically have been certified by three to five different agencies, on average. I'd guess that it would be difficult to show any relationship whatsoever to any one agency.