[quote=@Fabricant451]
Yes, this is how The Force will seek to balance itself by having the equal to the Dark/Light rise/awaken/whatever. 
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Yes, but before the Sequel Trilogy, the heroes actually had to work to be able to tap into it.  You're right that the Force seeks to rebalance itself and that force bonds can make it easier for someone to learn to use the Force even in the EU, a good example being KOTOR II (which was also a far better subversion and deconstruction of the setting than TLJ was).  Narratively, however, it feels unsound because they basically give Rey the power on a silver platter by giving her the force bond shortcut instead of having to spend a few films working hard and having to constantly be rescued until she can stand on her own two feet so to speak, and again I reiterate that I believe that it's because the execs didn't think that Rey would be as initially marketable if they made her take as much time as Luke did in the OT to get to around his level, because they believed "morally conflicted but already capable fighter" would sell more toys than "idealistic aspiring hero who starts out with no skills other than barnstorming and creativity with a grappling line, and as a result has to be rescued constantly until the third film".

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I'd argue that Rey was plenty developed in two of the three movies. Her development was just the antithesis to Luke's heroic journey archetype because for the first two movies she's refusing to accept her role in the events. There's a reason we're introduced to Rey in TFA by going through a day in her life. Rey's struggles are less physical and more internal but that doesn't mean she doesn't struggle or develop over the course of 7 and 8. It's only when 9 came around to ruin its own characterization that, well, ruined it. 
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The hard truth of the Star Wars movies is that apart from the two minutes in A New Hope and the, like, six minutes of Empire Strikes Back, across the prequels and the original trilogy we never [i]actually[/i] see the protagonists train much at all because movies aren't serials and dedicating precious runtime to lengthy training arcs is meaningless. All of Anakin's training happens off screen to the point where the Anakin in TPM and the Anakin in AOTC might as well be different characters. Yes, we can infer that Luke went to Yoda for a bit in the brief time between ESB and ROTJ but Luke at the start of Jedi is announcing himself as a Jedi Knight to Jabba as if he took the community college jedi course. It only became an issue that the protagonist didn't train in the first movie because suddenly it was unacceptable that the main character, mentioned by the antagonist to be, quote "[she's] strong with the Force, untrained, but stronger than she knows. 
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At least we actually saw Luke training.  We see Luke struggle to learn to block blaster bolts, and we see him struggle, and fail, to use telekinesis.  We see him decisively defeated by Darth Vader even after this incomplete training, and it's why it's so great to see him in action for the first time in Episode 6, because of how far our farmboy has come after two movies of struggling, stumbling, brushes with death, failure, and dismemberment that he's suffered through to get there.  And it took two and a half films (three if for some deranged reason we opt to include the Holiday Special) to get that far.  And then Disney has the audacity to turn him into a jaded failure who sits in hiding drinking sloth milk while the mess he created continues to snowball into a bigger and bigger disaster, so they can plug their new, superior chosen hero to save the day.