Rey is the chosen one.
One doesn't need to be a Jedi or Sith. One can only just be a force user. The first thing Rey saw in her vision was Luke's mechanical hand. What ever happened to that hand. A Jedi's lightsaber is tuned to a particular Jedi because of how its constructed. Clone technology is still known in episode 7. Palpatine knew how to create life, is what he told Anakin in episode 3. Rey was grown in the force from Luke's severed hand. Also, the force is not seen, only experienced. Rey is the prophecy. Remember that episode in the clone wars series. Just some thoughts to meditate on. The force is used for knowledge and events.