The only thing about rogue one that doesn't jive well for me with a New Hope is Vader. He was too badass in rogue one in comparison to the new hope Vader, which was slow (obi wan duel) and less ruthless. The rogue one vader would have diced Leia up and force smashed her remains against the roof of the ship, rather then talk with her, let alone put her in a cell when she wouldn't speak about the death star plans he knew she had. I don't see rogue one Vader caring one bit that she was a diplomat...