You’ll recall that during Star Wars: The Last Jedi, Kylo Ren killed Snoke and seized control of The First Order, so now the stage is set for Han Solo and Leia Organa’s son to take control of the galaxy as Supreme Leader.
However, if Making Star Wars’ speculation is correct, that could lead to one or more members of the Knights of Ren attempting to eliminate Kylo so they can control The First Order.
Whether any part of this rumor is verified or shot down, fingers crossed that the Knights of Ren are still involved in Star Wars: Episode IX, as they’re a story element that still hasn’t been fully resolved.
That’s definitely one of the few scenarios where it’s plausible that Rey and Kylo would have to work with each other again.