Linktrained,
From Part 2 of the final report (mainly based on the results of the work of the Human Factors group):
2.1.2.3 Control of the flight path
(...) Although the PF’s various roll inputs indicate his intention to keep the wings horizontal, it is not possible to determine what the PF’s target was in the longitudinal axis.
That must be based on examination of the FDR traces of
sidestick movements.
Then they say:
It would also seem unlikely that the PNF could have determined the PF’s flight path stabilisation targets. It is worth noting that the inputs applied to a sidestick by one pilot cannot be observed easily by the other one and that the conditions of a night flight in IMC make it more difficult to monitor aeroplane attitudes (pitch attitude in particular).
The first sentence is a logical consequence of the first quote, but what are they adding in the second?