Luke is appearing as a Force Ghost. The Force ghost was the soul and essence of a deceased Force-sensitive who denied the will of the Force upon death, yet was able to interact with the living. It also describes those who committed a final act of selflessness that led to their death, and have come to terms with it. Some Sith Lords learned similar ...


Luke was Red Five because he took over as the fifth member of Red Squadron from the former possessor of the callsign; Pedrin Gaul who died over Scarif a few days before. The Rogue One: Ultimate Visual Guide also makes it clear that the callsign doesn't relate to a formation position, just the point at which one enters the squadron, having taken over from ...


According to the Leia Princess of Alderaan book by Claudia Gray, it says that Leia did not know the exact day of her birth but that they just went by when Bail brought her home to Breaha; and you learn in the Revenge of the Sith book that Bail, Yoda and Obi Wan watch Padme's funeral so we can assume that it's not the same day.


With material now available from Rise of Skywalker, we can clearly see this is a T-65 rather than the newer T-70.

Only top voted, non community-wiki answers of a minimum length are eligible