I’m not so sure, a woman being present would have made it much more likely for SE to get into a car. Something like if a woman was driving and stopped to ask for directions and then said something like I don’t you to walk home alone, I’ll drop you home. Also its likely difficult to keep someone in a back seat on the motorway kicking and screaming with only a driver so the guy could have been the one restraining her. I’m just speculating, a lot of questions remain. I just can’t think of a scenario she would willingly get in the car with an older random guy alone. Also maybe they were closer to her age and seemed really normal.