Take it from me, this deal is cr@p!!!!
The 3rd pilot is a CAA variation required on flights in excess of XYZ hours (Can't remember without getting my Part A out!) in order to gain more flying duty period. In Silverjet's case, at the cheapest way possible! I can see where they are coming from but it ain't a good deal for some poor SO who's paid 30k just so they can stretch these B762's to the US West Coast...
Certainly not an issue when flying to EWR or DXB.
But...
If the longer routes are not happening...then I would guess, the 3rd pilot isn't either...