Having a S/O that can't operate below 5000 is one thing but an F/O , this is a problem .
F/O would be stressed enough dealing with a cpt incapacitated then to be PF and get it on the ground with no landing currency .
If some of these rumors are even %50 true then cpts who may be P2F themselves are doing every app and ldg , short sectors , over 100+ hours a month in atrocious wx .
Maybe cpt was arguing about fuel uplift before the flight ? If the whole truth comes out it will be interesting reading .