I hope people realize, that the characters on the VF photos were grouped together according to how we know them (for now, may change in the future *cough* I am looking at you Kylo.*cough*), essentially.
Rey and Luke were put together because they are both force users, and Rey is literally gonna be taught by him in the movie and is gonna be with him for most likely a lot of the movie (which we know).
I never call people stupid. But if you truly believe they were put together because Luke is her father-