why would they hire "the raid" people to do the action scenes? so anyone can pick up a saber now and do maul moves?
the in-between movies should be old republic stories. i don't need a back story on boba, solo and stealing death star plans.
Finn may be Force-sensitive. Rey definitely is as she is either Han and Leia's kid... or she is Luke's.
But Luke has gone into hiding for about the last ten years. There is no one to teach someone how to be a Jedi.
Lucas said that balance came from destroying the Sith, not from Sith and Jedi existing together.
Vader is redeemed and returns to being Anakin Skywalker. In addition, Vader/Anakin kills the Emperor.
So there are no more Sith at the end of Return of the Jedi. To bring the Sith back would be an insult to all Lucas had done. Lawrence Kasdan wouldn't do that.
As to Kylo, he is believed to be Han and Leia's son. He seems to have trained himself as best he can. He may have once trained with Luke.
He is skilled. He can use the Force and can wield a lightsaber with some proficiency. It is believed he cobbled together the lightsaber he uses, thereby explaining its primitive look.
The rumor is that he takes out Finn in about thirty seconds. Rey is said to fight him to a stalemate.
Now he may be going easy on her because she is either his sister... or cousin. Also, she would have more natural ability than Finn in being the granddaughter of Anakin Skywalker.
Kylo is a member of the Knights of Ren, a group obsessed with the Sith and Darth Vader in particular. They may be following Kylo because he is the grandson of Anakin Skywalker/Darth Vader.
He may have been kidnapped by the group when he was a child.
But Kylo answers to Supreme Leader Snoke.
We just don't know who Snoke is other than the fact that he is not a Sith Lord. Could he have once been an Inquisitor very loyal to Vader? Did he start the Knights of Ren?
This is unknown.
There is a new rumor going around that he is from the same species as Yoda. But I don't believe this to be the case.