Let me add something:
We're having some discussions based on data given by the Mexican authorities.
The same "authorities" introduce a THIRD PILOT in the cockpit, in a kind of non-authorized training action, making the beginning of the TO procedure until the PIC asks for the command of the AC.
This third pilot appears at the very END of the report, in a 36 words paragraph, as saying: "Ahhhh, we forgot to comment the TO started not with the PIC and the FO but with another pilot in training, playing FO, of course not authorized..."
If this third pilot made the beginning of the TO procedure, had to be seated in the right seat, am I right?
And the FO was in the "observer seat".
One thing is sure: the PIC was sitting in the left seat because had to be evacuated PILOT AND SEAT together when the AC took fire and this was made by the only Spanish passenger on board.
The FDR datasheet maybe not "that real" (this is a guess, I'm a bad boy)