In a cult, there are "insider" teachings and "outsider" teachings. The overlapping two-in-one generation is for those inside. The teachings geers toward indoctrinating outsiders are the less controversial, softball kind. Eventually, during a low and slow indoctrination process, they progress to teachings that the unindoctrinated would balk at. By this time, a person's behavior has been alterted (herding them to lots of meetings, door-to-door, cutting holidays and non-cult friends), and thus there thinking and emotions begin to align with that behavior.
For instance, Scientologists don't start off talking about Xenu, but self-improvement, and Mormons don't begin talking about their God of flesh and blood who lives on the planet Kolob, but how they follow Jesus and his teachings. They establish common ground and a normal image to the outside world.