I believe that anyone can use a light saber as a sword. But effectively using a lightsaber in a word where people have blasters would require force sensitivity. Talk about bringing a lightsaber to a blaster fight... If I remember correctly there is also some sort of connection between the saber’s crystal and the Jedi…

I also believe that the ‘awakening in the force’ mentioned by Snoke was Finn overcoming his storm trooper brain wash and becoming his own person. That’s probably why Kylo was staring at him and knew that he was the traitor as soon as the events were mentioned.

I have a couple of things to say. Some are speculations some answer some of your questions.

1) Finn - I believe he is force sensitive. I think that the scene were Kylo notices him and the fact that he knew that Finn was the traitor were supposed to clue us in into the fact that Finn had force sensitivity. I think…