Much has been discussed in regard to Reys lack of training and "power ups" as compared to the years of training that Anakin and Luke required to become skilled in the Jedi skills. Here is my take - I think Reys path is directly connected to the Force ghosts. Anakin was born as the result of the Force creating a Being that could bring balance to the galaxy. At this time there were no Force Ghosts as Qui Gon had not yet died. Although, in some ways, one might argue that in the end Anakin was able to complete his path, There was also a great deal of suffering and pain that occurred as a direct result of Anakins actions. When Qui Gon died his body did not become one with the Force but was left behind to be burned at his funeral. While able to commune with Yoda, he had a less active impact on the physical world .He was able to connect with Yoda but was not able to reach Anakin as he was massacring the Sand People. or to intervene directly. Obi Wan was able to transform his physical body into the Force before Vaders blade touched it and he was able to reach luke very quickly, urging him to run. He was able to guide Luke during the rebel attack on the Death Star and might have helped protect Lukes x wing during the trench run. Obi Wan was able to appear to Luke but was not able to interfere during Lukes duel with Vader on Cloud City or to guide Leia to Luke after his duel. Yoda was able to not only take his body with him when he became one with the Force but is able to control the weather and other Physical objects. Anakin and now Lukes abilities as Force ghosts are not as clearly defined but they do have the benefit of Qui Gon , Obi Wan and Yoda to assist them in their development. In my opinion, over time the first four Beings who became Force ghosts Qui Gon, Obi Wan. Yoda and Anakin had to work on their ability to interact with the physical world and learn. over time how to use their new abilities. Now lets look at Lukes training. Obi Wan and Yoda were able to take all that they had learned in training Jedi and have a very streamlined set of lesions laid out that took much less time and made use of Lukes own very strong Force potential. Even with this, It was not a guarantee that Luke would defeat Vader and Palpatine and Luke ignored their advice in going to Cloud City and being defeated. I think that the four known Force Ghosts, looking back on Anakin and Lukes struggles and not wanting the past to repeat itself , took a much more active role in the birth of Rey, encoding abilities directly into her DNA to be unlocked when certain situations or stimuli were present. We even have Yodas statement that all the wisdom of the Jedi texts are already inside her. To me, this strongly implies direct manipulation on a very deep level. Reys path is not Anakins or Lukes. It is not required. Her struggle was not to gain her abilities but to learn her path and be willing to take an active role in unfolding events. Her story is much like Supergirl. Kara arrived on Earth, not as a baby, but a teen girl. She had endured massive loss, as Rey did when her parents left and both were very strong without really needing to work to become strong. Reys story is the fear of change, of leaving her comfort zone, of whether she is worthy to carry the hopes and dreams of the oppressed on her shoulders and in her heart. Can she use her power in a responsible way for the good of others or we she be tempted by darkness? How far will she be willing to go to redeem Kylo? Reys story is compelling and beautiful on its own merits and does not need to conform to what has gone before. I think Rey is able to stand on her own merits.