About the preprologue:
I wonder if this is going to be an infinite loop sort of thing? Considering Terry remembers the player in the future. Or assuming the statue of the saviour was the player, maybe even the multi-timeline theory where the player that travelled to the past died — and the future player is them from a different timeline, about to repeat the process. Wouldn't explain how Terry remembers them though...
I haven't finished chapter 4 because I have the reaction speed of an elderly so not sure if there's any details revealed at the end.