Always remember, first officers are just as qualified to fly the plane as the captain. The first officer (or were there two first officers?) were in the cockpit-they have to be “type rated” in the plane just as the captain. He just doesn’t have “the label” as captain. Just something to consider.....
They had about 20,000 hours of cumulative flight time between the three of them.
Its unknown who pilot flying (PF) was and pilot monitoring (PM), but my guess is 2nd officer was PF (as the captain was on break at the time). My guess is that the FO was logging acting-PIC hours, and the 2nd officer was logging acting-FO hours.
That's not how it works out all the time (captains discretion). Also, there's a difference between FO hours and PF houirs (they might not be the same). If FO is PF, then captain (if flying) would be pilot monitoring (PM) - and does all the grunt work that the FO normally does.