Okay, trying to sort everything out in my brain here....... The POI was seen by a number of people. Some people saw the POI standing up outside the car, some saw him sitting down outside the car. That would say to me that the at least some of the witnesses drove by at separate times. Keeping that in mind, along with him changing positions, that means he was there for a good period of time. If the girls were already dead, then why was he there THAT long? I'm guessing the cars weren't one right after the other if he had changed positions. It doesn't make sense to me that he would just hang out, half in the middle of the road, with two girls he just killed. What if someone had stopped and asked if he needed help? Why would he put himself in that position? And being outside the truck, he wasn't even in a position to get away quickly if need be.
If he pulled his truck into that position to shield that he was killing the girls, don't you think that would have given them time to run, or at least get further away, if they didn't know him? I know as young girl I would have found that kind of freaky and tried to move away from the guy.
Also, the witnesses gave an incredibly detailed description of the guy, down to eye color. I don't know about everyone else, but if I saw someone suspicious by a vehicle, I wouldn't want to stare at the person long enough to get that much detail. But I WOULD make it a point to get the license plate. All of these people had a good enough memory to give a detailed description of the guy, but none of them, or even all of them put together, could come up with the license plate number? That just seems weird to me.