If it's not her, and yet LE is seriously considering the witness information, then why is there no composite? How can a witness or perhaps multiple witnesses have seen this person and yet have absolutely no idea about the person's physical make-up -- not the gender, skin color, age, facial hair, hair color, general build, nothing. So either the witness is credible and can give a description, but LE's not releasing that description for some completely inexplicable reason, or the witness can't give a description, came to light two months after the fact, and you're left to wonder about the credibility of the witness's account.
SBM.
The truck has tinted windows. Perhaps the person/people who saw someone in the truck, but couldn't get any details due to the window tint only allowing a sillohette. That would allow them to tell that it was an adult vs. a 7yo, but not male/female, skin/hair color, etc. And perhaps they know this person in the truck isn't TH, because Terri was seen outside the truck (perhaps with Kyron).