Quoted from tl54hill:
I want to believe they will try and fix this mess, but they have boxed themselves in from a storytelling perspective. I feel like this last episode will be fairly predictable, because they just don't have many more story options left.
This is the entire problem with Episode 9. They are really boxed into a corner.
If they decide to make Rey Luke's daughter, it's just not going to make any sense when relating back to Episode 8. Luke just completely forgot he had a daughter? No that's just NOT possible. He had absolutely no clue who she was in Episode 8. Even being told she was from Jakuu meant nothing to him. She was dumped on Jakuu when she was what, like 6 years old? Where was she all that time from birth that Luke didn't know? When Han was offering her a job in Episode 7, I always had the sense that he MIGHT have suspected who she was, and wanted to keep her close to him, but he wasn't letting on. Leia again had no clue who she was either. I mean Luke & Leia are siblings & can speak to each other with the force (ex on Bespin, Luke calls out to Leia while dangling beneath Cloud City), but they can't even sense their own blood standing right in front of them in Episode 7 & 8? It's just a mess. This is why you don't let 3 directors tell a singular story.
The only way I see it: Mara Jade had just become pregnant with Rey at the Jedi Academy, but Luke had no idea yet. She tells Ben Solo that's she's going to surprise him with the news tonight. Ben becomes intensely jealous of this new Skywalker offspring, and this is the spark that allows the dark side to call to him. Luke senses Ben is turning to the dark side & the first seeds of uncertainty creep into Luke's mind, he panics at the thought of the Sith returning. He tells Mara, who is repulsed by Luke's dark thoughts & wanting to kill his own nephew. She tells him he's wrong, that he's actually the one who is turning to the dark side. Luke panics, and then attempts to kill Ben in his sleep. Ben becomes enraged at this & turns to the dark side fully, becoming Kylo. He and his fellow trainees (the Knights of Ren) turn on their master & defeat a broken-willed Luke, burning the whole Academy down. Mara sees all this & flees, knowing she was wrong & that Kylo is going to come after her & her unborn child Rey.
Mara disappears & has the child, but Luke is now a broken man & disappears himself. He has no clue Mara was pregnant. He gives the missing piece of the map to Lor San Tekka, and tells him if Mara ever changes her mind, she can find him on Ach-To. He wants to be completely left alone, because he is a failure & cuts himself off from everything & everyone. Kylo & the Knights of Ren are recruited by Snoke. They know Mara was pregnant, but they have no clue of the details, or where Luke or Mara are. When Rey is around 6 or so, they get close to catching her, so Mara dumps Rey on Jakuu. She tells Han Solo & Lando just so someone knows where Luke's daughter is hidden, and perhaps this also ties into why the Millennium Falcon was hidden on Jakuu as well. Mara flees to Tatooine & remains hidden, promising that she will return someday for Rey.
There's your backstory for flashbacks. THIS is what Episode 8 should have been with Luke, Mara & Rey all reuniting at the end. Episode 9 would have been the final battle between the reunited Skywalker family vs Snoke, Kylo & the Knight of Ren. A personal family story of redemption, instead of more rebellion vs first order nonsense & exploding planets & super-weapons. We got a huge smoldering pile of shit.
So now in the current smoldering pile of plot holes & bad writing, they will attempt to fix it in Episode 9. It's going to be an impossible task. No matter what they do, there are just too many inconsistencies to tie it all together nicely. The countless worthless characters (Finn, Rose, Poe, Hux, DJ, etc) have to be demoted to the 3rd string characters they truly are. To make this work, they have to have at least a third of Episode 9 be flashbacks & plot hole filling. I still firmly believe that Mara will be the key to tie everything together. Rey & friends will piece together the clues in a race to find her before Kylo Ren does. Going to Tatooine, getting info from the Hutts, tracking down Lando's info on Mara, etc etc. I have not read ANY spoilers for Episode 9, so I really have absolutly no clue what they are planning to do. I don't even know if someone was cast as Mara Jade.
That said, somebody at Lucasfilm should hire me. This shit is not difficult to come up with.