It seems most likely,finally, that the Pf was indeed the least experienced f/o ,in the rhs (frozen atpl)
This leaves the other f/o as pnf in the lhs.acting as 'commander' in the absence of the captain.with all the responsibilities that involves.
it seems pretty clear that he had had no training whatsoever in sorting out problems of this magnitude,especially from the lhs.probably never ever had to recover from a fully developed stall at high level in the sim .
how can this be ? something is seriously amiss here ,in the training department?