Can't find any information that suggest that a FE is required, only that the crew consists of 2 pilots and 11 mission crew. Nothing to suggest that it needs all 11 either.
It would seem unusual for a brand new design to require a 3(+) person flight deck, perhaps th 3rd head was merely a 'guest' or extra pilot along for a 'jolly' - wouldn't exactly be unusual for a visiting a/c from far afield.