Lightsaber in space

One of the first rumors to ever appear about Star Wars: The Force Awakens was about the opening sequence. Back in 2014, when there was literally nothing known about the movie, it was said that The Force Awakens will begin with a shot of Luke’s hand holding out a lightsaber, entering the atmosphere of an unknown planet.
Of course, the rumor did not explain how the hand and the lightsaber ended up in space from the first place, when the Jedi lost them in his fight with Vader in the Cloud City.
Apparently, this scene was actually in the movie, coming right after the opening crawl. But J. J. Abrams decided to cut it out and open Star Wars in another way. And this is actually a good thing, since the same question would have remained unexplained in a proper and satisfying manner: what the hell was the lightsaber doing in space?
To be noted, this would have still been a good opening shot, especially since it connects The Force Awakens with both the prequels and the original trilogy. The lightsaber was constructed by Anakin and then was used by Luke Skywalker.
