OK, here's my thoughts. Please tell me what you think
Did Syd tell Vaughn only part of what was in the Wittenberg Docs?
The docs were clearly about a "project" that is clearly sydney and started on her birthdate. The request from Jack might have been with the SAB documents, but her explanation...
I'm not sure if everyone is on the same track but.......
I think Lauren was sent in to the picture when Syd went missing to get close to Vaughn in case Sydney contacted him and to be there if/when Sydney came back. She manipulated him into falling in love with her. The people in the car...
Lauren isn't the chosen one. She doesn't fulfill the prophecy.
It would be a cool story though. Vaughn thinks it's his;
then the big bang when he finds out...