Yes, I'm completely aware of this. I know literally everything that happens in the movie.
Again, no, Rian did not, because he was not told what the plan was, because *there was no plan*. TFA and TLJ connect seamlessly. TROS does not.
So what!? So what!? He left the door open with *so many more* questions. What would Kylo do as the Supreme Leader of the First Order? How would he react having everything he ever wanted, but finding it to be a hollow victory? How could Hux, a rabid cur, somehow undermine Kylo to the point of getting the power he always craved? How would Finn, Poe, and Rose put together a Resistance that stood any semblance of a chance against even more overwhelming odds? How would Rey react now that Kylo was truly gone? Would she choose to try and redeem him still? Or would she realize he needed to be killed, tempting her to the dark side in the process.
All interesting, new avenues for Star Wars, and instead we got a half baked ROTJ clone.