I think it would be kinda cool to have a one off mission/strike that shows how our guardians died and what led up to the ghost finding us. and they wouldn't exactly have to make it like a bare bones mission where you have no abilities/ect. Once you die and your laying around, others could have scavenged your armor and weapons, and being dead wrecked your memory of the trained abilities you knew before. ...not exactly on topic but your time travel proposal made me think of that lol.