Even if James had NFI about using the auto pilot and sending the FO out of harms way to assist, the FO should have done it, as a matter of 'trained' to do so. They will only do what they have trained to do as per the CASA approved system of training.
As I've said from day1. What did the F/O contribute to the flight? Apparently she showed no interest in the flight planning. Was she just xxkgs of excess SLF?
Even if James had not wanted to involve her (why I would not know) SHE should have taken the INITIATIVE and INSISTED on checking his figures.
She is not without blame and had a RESPONSIBILITY to check his figures.
Hell. In the past I've grabbed F/O's by the ear and ORDERED them to check my figures.
It is a
CREWED aeroplane, is it not?