Creative Art Manager Lucasfilm Phil Shostak on his page on Twitter published a post in which he said that it was originally in the film "Star Wars: Skywalker. Sunrise "Want to include a side-scene line about a new light sword Ray Yellow. As a result, the authors had to abandon this idea, and the yellow light sword appears only in the very end of the picture. The Shostak laid out the conceptual army of the handle for the new weapons Ray, and in response to the question, why was it necessary to be so bored for the sake of props for one scene, he wrote:
This light sword was supposed to appear in more than one scene. The film had to be an additional storyline, telling about how Rei will make a new sword to himself using the texts of the Jedi as an instruction.
Interestingly, in partly, this idea was implemented in the novels of "Star Wars: Skywalker. Sunrise ", which was the author of which Ray Carson became. The book establishes that Ray wanted to construct a light sword with a double blade. At the same time, in the film, when "Dark Rei" appears on the screen, it turns out the sword with a double blade of red. This moment foreshadows the revelation that Rei is the granddaughter of Emperor Palpatine.