What can't be ignored regardless of what the cause, is the fact it was never detected by HUMS, CHIPS, FDR, CVR, SOAP, ENGINEERS, PILOTS
Whatever failed first it gave no warning at all!
I am not an expert on the Super Puma but have friends flying them. I agree with Buzz66 on the fact that there was no warning thus no pilots reaction time to this accident. This is a major set back in confidence on the platform for both pilots and passengers whatever the outcome of the investigation.