Someone pointed out the need for more detailed information and I totally agree.
Let us wait for the findings of blackbox and pilot information from an investigation team before starting to speculate the cause.
All options are open and that is some too many.
May I suggest that any technical information is always welcome, such as A/T use on approach, fuel control systems and computer/human decision making. Oh Man!, wasn't the DC3 "simple" in comparison? Maybe, this "simple" fact should be included in the KISS approach to design.