The tidbits of information we receive from local authorities makes piecing this thing together very difficult. We don't have much to go on. They mention having several possibilities and nothing is off the table. They just don't have what they need for a conviction. I keep thinking about Jessica's cellphone. They would have to know by now who she had talked to. If any of those people were/are suspects and yet have an alibi (which could be a lie that authorities cant prove) for where they were at the time of Jessica's death, they wont hold them. And then the possibility of Jessica running into someone that night unplanned or planned way ahead of time. What I keep wondering about is why wasn't Jessica actually dead. You would think that if someone wanted Jessica dead, she would have been. Was it lack of experience? Did she fool them into thinking she was dead? To me, I'm thinking 1 person involved if it was romantically related - maybe she shunned them? They were high and went into a rage? The reason for reclined seats. I could see it being 2 or more if she ran into a group of people that had it out for her. I wish we could know more about the party or gathering.
Panicked, inexperienced murderers could very well have misdiagnosed Jessica "as dead", then quickly determined that they needed to cover her "death" as an accident. For example, if they struck her unconscious in a wild moment of rage, then shook her back and forth, wailing "Jessica! Jessica! Jessica... My god, you've killed her! What are we going to do, what are we going to do ?" then it is quite conceivable that Jessica's unconscious state could have been interpreted as death.
Jessica's unconfirmed gash on her head may have been due to such a scenario.
I would think though that in such a scenario...for Jessica to remain unconscious during transportation from a primary murder scene to the Herron Road location would have involved a major concussion and easily been determined by the coroner. Yet if it had occurred on Herron Road then such an injury may have kept Jessica unconscious long enough until the accelerant suddenly shocked her system enough for her to regain awareness.
*Note: All the above, is obviously pure speculation and should not be considered as anything other than that.