I had read your post not long after you submitted it and I happen to agree with much of what you say. I have only two things that I don't totally agree with.
You mention killers only kill for three reasons. Money, sex or revenge. While almost all murders will fit into those categories, you're forgetting the certified crazy people, like people who throw a random stranger in front of a moving subway.
You also mention her cell phone having no merit. That would all depend on exactly where it was found, where the battery was found and what type of phone. Do we have any factual information regarding this? I've seen it written on here somewhere that the phone was found in a ditch not near the scene. If it wasn't near her car, then it wouldn't have been tossed out her car at the scene while her car was stopped. It would have had to happen while driving or tossed after. If the battery wasn't found nearby, then it couldn't have fallen out when the phone landed and it would mean it was taken out and tossed separately. Some of the phones now, you can't remove the battery without taking the phone apart. Much to my dismay I have a phone like that. I was disappointed to learn that if I should need a new battery, I will either have to learn how to take the phone apart or pay someone to do it for me. Had I known that prior to buying it. I probably wouldn't have bought it. If that's the type of phone she had, then the battery shouldn't have fallen out when it landed and the battery should still be in there unless the phone completely broke apart.
Thanks Droopy for the response!
I will say this in defense of Sex, money and revenge. Studies have shown even the crazies and sociopaths kill for revenge. It may be revenge "because my mom never loved me" or "daddy beat me" or "I was abused as a kid" but they always kill as a way to take revenge on someone, even a long-deceased parent etc. That said, either way I think we can concur that 99% (although I think 100%) kill for sex, money, or revenge.
Interesting observation on the phone, and I agree that it could have ended up some distance from the crime scene. I have no way or knowing where it was located, but was merely trying to put this together. The location, still though, even at some distance could have happened again, when driving, arguing, and her trying to make a call or receiving a text and the killer simply got perturbed and in the process of arguing slapped her hand and it went flying out of the car before the car stopped.
That said, I still think regardless of where it was found, it was simply because the killer could not locate it in the darkness and elected to leave it in hopes it would not be found. About the phone battery, you are correct, phone batteries and compartments are all different, but the vast majority of battery compartments will pop open when dropped.
I have dropped mine many, many times, and almost invariably the compartment pops open and the battery drops out.
Whatever transpired I do not feel a "crazy" out there did it. I'll stay to my original opinion. Jessica, god bless her, ran it appears with some pretty dubious characters, and I assume it caught up with her.
My mom always said, "Show me your friends, and I'll show you your future." Unfortunately, Jessica did not have much of a future.
Nice to know though we tend to agree most on the hypothesis that I laid out. I did like reading your post as well. Thanks for allowing me to chime in.