i disagree, it had to be all rolled out in the first film. Rey could have just been an excellent pilot without any obvious force powers. she escapes Jaqu with Finn on the Falcon and they meet Han & Chewie, he hears about the FO looking for Luke, he then says something like, "i know somebody who could find him." he takes them to that planet with the goggle eyed bitch maz kanata. they meet maz and she takes them over to a table in the cantina and its Luke, who BTW still has his fucking lightsaber (like why would he leave that there in the first place?). then when Finn and Rey find out thats actually Luke, they tell him whats going on, he says he's too old for this shit, but Han convinces him to come along because Leia put him in the doghouse for abandoning her and Darth Emo, so he comes along because he misses his sister.
along the way they run into the smugglers and hilarity ensues. Luke has a handful with the space dragon, rey is fleeing with Finn and at some point Rey is cornered and about to get killed, she lashes out with a Force hadouken. luke sees this and starts telling her about The Force and how she could be a new breed of jedi. blah blah it goes from there. Han brings them to the death planet and tries stop Darth Emo, he gets killed. Luke says "nooooo!" and they run back to the ship. there is no duel with Emo, they blow up the death planet and Darth Emo is pissed and throws his tantrum. him and Rey never meet for the entire movie. movie ends with Luke telling Leia what happened to Han and how it was her son, Darth Emo who kills him . she then tells him. "i have no son" , Luke tells Rey, i wil train you to develop your force powers to defeat Emo becausae as i said, i am too old for this shit. end credits. see, practically the same movie, but Luke plays a bigger role.