Re the discussion of FDR parameters.
Without knowledge of the specific parameters recorded for this FDR, it's very dangerous to assume that "parameter X is important therefore would be recorded".
The FDR parameter list which is REQUIRED for certification, per the FARs and the equivalent other regulations is very much a minimum list. You may be surprised at just what can be missing. For example ....
glob99 posted this list. Check item 42, "Throttle/Power Lever Position". There is a Note to that requirement, which states that it only applies to airplanes with "non-mechanically linked cockpit engine controls". Which means that on any non-FADEC aircraft, where the engine is controlled hydro-mechanically, there is no recording of one of the main control inputs by the crew. Logically, throttle is quite important; you'd think an accident investigation would like to know it. But it's not required on some aircraft at all.
Bluntly, if it's not on the regulatory list, it's safer to assume it ISNT there, unless you have the actual spec to hand.