I get where you're coming from, Prime; and if JJ retcons Rey's lineage reveal from TLJ, I'll have no problem with that. But . . . isn't Rey being called to the lightsaber at Maz's similar enough to Luke being drawn to the tree cave on Dagobah?
When Luke was drawn to that cave, and a vision/revelation was waiting for him there, it wasn't because he had some family connection to anything in that place. And that scenario didn't need any specific explanation; we just accepted that the Force was sending Luke a message. It certainly wasn't a message he had been asking for, wondering about, or expecting.
So, is Rey being called to the trunk/box at Maz's really all that different? Why does the lightsaber need to have a lineage connection to Rey in order for the Force to get her attention through it? Kenobi was the one calling her by name in that TFA vision, and telling her that these were her first steps. He's part of the Force now, so it could just be that the lightsaber itself is imbued strongly enough with the Force to be used as a beacon to reach out and send a message to this new potential Jedi. Like how the tree cave was used in ESB.