As yet, we don't even know for sure whether there were two functional pilots in the cockpit at the start of whatever chain of events led to this catastrophe. The greater probability is that there were, but nothing can yet be ruled in or out in that regard.
All we know is that a seemingly very experienced captain in terms of handling conditions in that part of the world, and his FO, ended up in the drink.
I hope the interpretation of the FDR and CVR is more accurate than the head of Barsarnas has been of late.