That's totally understandable given the size of this game! So just to make sure, the Crew Replacament entries for the various factions/trends don't do anything in the current version of the rules?
They’re not currently used. They’re there because of my indecisiveness about what to use them for - it makes no sense that a crew would necessarily stay together for 60 years and I need a mechanism for player turn over that explains what happens when you’re 5 years from the nearest colony - and my cowardice when it comes to deleting them.