I've wondered the same thing- if the footage was so terrible, how could they be certain which car belonged to each person? Just because I don't think there's enough evidence to completely rule out a drug-related occurrence, could Car 1 have been a dealer, Car 2 have been DW/DNV and Car 3 have been the other? JUST BRAINSTORMING If DNV set up the deal- which I think people go to because, well, we assume she knew people based on her people circle- and realized she left her phone, maybe she signaled DW not just to say she lost her phone, but to also let him know this is where we're going?
Admittedly, I don't think this is likely since both cars got there at 11:05, but sometimes brainstorming on other ideas does help rule out things.