I was wondering about the COS '08 situation in which moving to HKG is guaranteed, won't that like block many S/O's from progressing on to the JFO position if suddenly many cos'08 F/O's from N.A or Europe automatically move here?
Nope, because another FO would move to that base to fill it, or they'd crew it with a HKG FO, so it's all neutral.