If the crew observed themselves undershooting the touchdown aiming point so badly they would not even make the runway then they would have immediately attempted to go around.....an item on a B767 go around is to select flaps 20.....possibly this is also true on the B777....
failing to get any thrust...they elected to then landed straight ahead....Hopefully everything regarding the pressing of goaround mode and the throttle lever position for goaround...pitch attitude transiting to go around target pitch... etc will all be recorded on the tapes...and this IMHO could explain the flaps 20 position.