Qualified 2004......made a captain in 2016.....and an instructor later in the year; that's a bit odd. Very few hours in recent months too. With a very inexperienced group around him in the front 3 seats, the captain's mishandling was unlikely to be picked up. I wonder who authorised the flight........in my day, I would have thought very carefully before doing so.....
The supervisory chain needs to conduct a fair amount of corporate investigation in my opinion.
A very sad end.