That was the same reasoning I had about the mystery man too. It bothers me as well, but I've just come to a point where since I can't reconcile it, I had to set it aside. It seems like LE must have a reason not to be focused on it, or even really give it any credibility. It doesn't make sense to me that LE says they won't use it in their official time line because there isn't any video evidence to back it up, however they do include JR's story about watching her walk to the corner without any video evidence.
The white truck still bugs me too, a lot. Just like the white truck in Samantha Konings case bothered me, but when I'd try to work with it, I was always reminded that LE had cleared it. Now we know that wasn't really the exact truth at all, in fact the exact opposite was true. I wonder if it's the same with this white truck. It could be, but then it could be really nothing. Soooo frustrating. If it isn't really cleared that doesn't, in my mind, clear any POI in favor of a stranger abduction at all, it only implicates certain POI's further.