The more I think about, Qui-Gonn is a fair idea as long as long as it done properly and Luke does think who is that bloke with Anakin Obi Wan and Yoda (and Liam is acting and its not other footage etc) but Mace or any of the rest of his Jedi Posse is overkill, my big objection and Commander Courage will disagree is Padme, that would for me stretch realms of believeablity and is too convient a happy ending