To seat on the left seat you need 2000 PIC on ANY Boeing a/c
AND 500 PIC on 777 which I doubt a CX JFO has. (I meant the 777 PIC time)
Nevertheless they can still apply for relief Captain which is still a First officer
position on the paper, probably with a faster upgrade. (but still needs that 1500 PIC time on at least 737NG)
There are still some shortcuts you cannot take....
Which I personally don't agree... (If you have 737NG ETOPS experience as a PIC in excess of 2000 hours, I do not see why you could not qualify for DEC on 777 or 787 except if they have already this 777 PIC's under their hats available.
PS:sorry did not see all but JFO...my mistake, but I doubt that senior F/O's
have that 500 PIC as well on 777 in CX
or probably not that many...