Bit early to be apportioning blame, chaps?
The investigation has a long way to go and minor anomalies in the preliminary report to clear up. The two flight crew have yet to be interviewed,
AFAIK, and the unofficial third man is sadly deceased. With a crew debrief still pending, even if a recording of all cockpit conversations is available from the Go-Pro camera it's quite right that its transcript be withheld at the preliminary report stage.
Right now we can try and work out what may have happened, and what the crew probably did. We may also like to form an opinion, from the unhurried comfort of our armchairs, on what might have been done to mitigate the effects of the failure(s).