The Death Star II wreckage was originally going to be in "The Force Awakens" and on a general "Junk planet" which eventually became Jakku. (Making it a desert world similar to Tatooine I think didn't happen until later on).


Makes me wonder if the space junk in this version was originally going to be from the Battle Of Endor, and not from a separate battle which was apparentally the Empire's true final defeat (As shown in the Battlefront games and some novels).


Kef Bir of course had the Death Star II wreckage in ROS, and was pretty much revealed to be another moon of Endor where the wreckage drifted to instead of the Forest moon (and also putting to rest a fan theory that the wreckage had landed on the moon and killed the Ewoks). We do of course see the forest moon-it seems to briefly appear when they arrive at Bir, and then we get the Ewoks later on celebrating the Star Destroyer being destroyed (Which wasn't there when Rey and co. arrived-I'm guessing it stopped by later to drop off Kylo or to wait for the Sith destroyer to arrive-ditto with the ones near Bespin, Jakku etc).


So I'm kind of curious if they intended for that to be the case. Also, kind of curious why Rey was checking out the DSII wreckage in the concepts for TFA. In a way, ROS's wayfinder is a macguffin similar to TFA's-a map, so maybe it was some version of what eventually became the map to Luke, before Abrams decided to make it more ANH-style by giving the map to BB8.