ANDRAZ, you have made the best statement so far..
There are a lot of speculations about what happened, based on very very few information, some of them not even reliable...
To make an investigation, for crime or accident, the process has to be followed carefully, following a protocol, step by step, and by PROFESSIONALS..
First is to gather information, then built different scenario and confront them to probability of happening... I know it is a forum, and everyone can express
but I do think that there a lot to much speculations here..
I do work for many years in aviation, as engineer, and I do fly, and one thing I learned is not to go to fast in diagnostic...
So I do not have an idea of what happened, and if someone ask me he or she will be very disappointed to hear me saying "better to wait for the Cvr and DFDR to get an idea"