I'm going to take a guess that HR arrived in town in the very truck that he co-owns with RR, after RR toook the truck that morning and drove Isabel to Douglas and handed her off to relatives. Then, he gave HR a ride back with him. No wonder they searched that vehicle. They may indeed have it on camera as being at the house in the early morning hours. Recall that they also searched RR's cell phone and photogrpahed his texts.
Some here may think I'm cynical, but nothing else fits together as well as taking this child and tucking her away while her reknown and the donation fund grows. I really think some of the adults in this family came up with a twisted idea to make money off of her disappearance and make her "famous" and they are sticking to the tattered script even as LE signals that they're on to them and that they WILL be prosecuted. They just want the child home safe first.