the vader papls scene will add solidarity to the films its would work as a summary, of all that happened and they dont need to go over everything, i think that luke destorying the deathstar and talk about DS2 would be all that is needed. as for the fett scene its not needed in the movies. the only reason it would be added is if there was going to be 7-9 and fett was in one of them. otherwise his survival can be left to the EU.