In the Art of Book it says that in previous versions of TROS, Finn encountered a sibling on a wreckage world.
https://i.redd.it/j967ydbvib451.pngIn the early leaks Janna was meant to be Finns sister and it would have been later revealed that Lando was their father (evidently from the visual dictionary and novelisation)
MSW: https://amp.reddit.com/r/StarWarsLeaks/comments/d4z5ju/msw_star_wars_the_rise_of_skywalker_leaks_on_finn/Didn’t Boyega also talk about his backstory getting fleshed out in one of the interviews?
Janna being Finn’s sister explain so much and implementing it would make Finn’s role in the film feel less non-existent. It also ties the whole planet-hopping goose chase into a cohesive narrative rather than half a movie’s worth of filler. Each planet is about one of the main trio reconnecting with their past. Pasaana has Rey confronting her parentage, Kijimi has Poe confronting his past as spice runner, and Kef Bir has Finn confronting his forcefully broken family. It all makes sense now. Suddenly it feels like Abrams and Terrio weren’t completely pulling stuff out the blue and filming a first draft. The sibling dynamic removes the feeling of Jannah being Rose’s replacement too! We have to implement this!