@Philipat
However, if YOU were in such a situation as Pilot 3 or 4, would you still be sleeping as the plane landed? Where would you most likely be?
There would have to be a very good reason not to be at the "pointy" end if the option was available, which is, I believe, exactly what you were suggesting.
That doesn't mean, however, that the "spare" crew were . . . and, given all the cultural comments that have been made here, with a TC in the RHS, perhaps they would find it preferable to be elsewhere!
(though if they WERE in the cabin, I doubt they'll ever do it again . . . if they get the chance!)