Finn has the force as Rey has. Finn has always had this intuition who tells him what to do and where to go. In TROS, Poe ask him where they have to go at Kylo's Star Destroyer and Finn quickly said 'don't know, follow me' and started running in the right way. Because he really knows where he should be. Also, let me tell you, he felt Rey's 'death' and he has always been so connected to her (people, stop thinking he has a crush on her, is the same connection Leia and Luke had and he is in love with Poe ups). For not saying these fight he had with Poe where Finn said he knows - again- what Rey is feeling inside without an explication, as the same way Leia knows, and we got Poe like well im not Leia, dude I cant understand you all. I think thats the moment Finn realices he has the force.
AND CAN'T FORGET about the moment in TFA when he took Luke's lightsaber and try to fight with Kylo Ren to protect Rey who was k.o for a few minutes.
And obvs, he felt he was doing the bad things when he was a stormtrooper.
Finn has the force. He has always had. And i think he could be a great jedi if he wanted it to, don't you think?
