For me, it opens up the possibilities of so many other things happening. What I mean is, if I was a jury member and this is the timeline and I was still told that during those few minutes she was kidnapped and murdered AT PTL, I would have a very, very hard time believing that. Also, being then told that the car was found and that the police let her father drive it home which suggests there was no crime scene at the time of arrival. I am really struggling to see things. I know murder can happen in one second. But, with this timeline, there is no time to clean up anything.
Also, heather would have most likely got in the front seat. The theory is that she was strangled from behind. They would not have continued to drive with her down the road for fear someone would see her. So, I question how they were able to kidnap her, murder her get her wherever (backseat) and get past that video camera so quickly. My guess is they are not on camera and that will hurt the case because there is no proof which one if any did it.
I still go back to one of them or both showing up at her house after the pay phone calls. Him, not to hurt her and Tammy because she was pissed.