Elaine and the guy took a uber to go to the movies with a bunch of cars available at that home, including hers. The car situation is weird. If she wasn't the one who left the car there (which, I don't really believe it was her), then it couldn't have been someone alone. Whoever did it, had help.
If the Elaine was abducted shortly after leaving the boyfriend's house by more than one person, this kind of changes the "movie" playing in my mind about how Elaine could have been abducted. See below:
Two person scenario:
1. Two kidnappers somehow stop Elaine who is driving home around 6:30am on a chilly Saturday morning.
2. The kidnappers take her in their car without damaging her car interior or exterior. Elaine is a tough, strong woman. Is she fighting back? How did they subdue her or convince her to stay quiet?
3. One of the kidnappers drives Elaine's car to the PCH while the other follows in their car.
4. The kidnapper driving Elaine's car arrives at the PCH, leaves the keys and all of Elaine's possessions, then gets back into the vehicle his/her partner is driving closely behind in. Elaine is also still in this vehicle.
5. The boyfriend's house is approximately 10 miles away from where Elaine's car was dumped so let's say it would take 20 minutes for the drive and maybe 30-40 minutes in all for the abduction and car dumping.
6. If sunrise in that area of Malibu during late January 2017 occurred at about 6:55am, then most of this abduction could have occurred under the cover of darkness, adding another savvy element to a seemingly skilled abduction.
7. There's a lot of evil duos out there like Julius and Ethel Rosenberg, the Menendez brothers and Elizabeth Smart's kidnappers. The question is, who are the ones who operate out of Calabasas and Malibu? If we're talking about a skilled kidnapping duo prowling this area, the list of potential suspects gets much smaller.
8. Can someone poke holes in this theory? It's good to build it up and tear it down a few times to see if it holds water.