I just find it very hard to believe that for the duration of the stall (Recovery attempt ?) the stick was held all the way back ?
It's very easy to blame the pilots (3 experienced pilots) but could it be something else such as a computer malfunction ? The stick may have been pushed forward but the computer decided to send an elevator up command.....and therefore the DFDR data recorded seems to point to a pilot input rather than a computer command ( I think there has been a few similar incidents). There is much much more to discover...