Up to now I didn't heard any SFO upgrade to Captain in GWL. As per CAAC rules, the FO of B744 can't be upgraded to Captain directly. FO shall have to be the captain of smaller aircraft, i.e. B737, B757. then they can be further upgraded to the captain of B744. Unfortunately GWL does not has such smaller aircaft. In GWL, they assign some senior FO as the RPIC of the flight, something like the acting captain under condition that only one captain onboard.