I have one that accounts for all 5 points, but I'm not saying it's a good one. This is all hypothetical so please don't ask for sources even though I'm stating it as fact. TIA
The "man" decided to go on the prowl that day/evening, but obviously didn't want to hunt too close to home. He drove to Brooklyn, and stopped at the truck stop (point 1) to buy a few supplies. He's been there enough times in the past to have a good idea where the cameras are, and was able to avoid them for the most part. I believe he was wearing a hat and sunglasses to help obscure his face. He bought duct tape, gloves, a small rope and probably a few other small items to make his purchases less suspicious. He put on the gloves, left there and started checking out the town. If there had been no easy mark, he would have just moved on to another town.
Mollie was on her run, and was just crossing the street by the car wash (point 2) when he came by. He drove around a bit checking to see how busy the streets were, and how likely witnesses were. When he decided that he had a good chance of success, he went back and tracked her down just as she was getting ready to turn onto 385th (point 3) to get back home. He stopped, grabbed her, duct taped her mouth, hands and feet, threw her in the back seat and took off. Because he caught her off guard and she was pretty well worn out from the run (and probably at least a little out of breath), it only took a minute or so to complete. He then drove following 385th through town, without worrying about being seen because she was out of sight in the trunk.
When he got to 385th and 200th (point 4), he turned into one of the field roads, turned off the lights and got into the backseat. After he did whatever he planned to do, and strangled her with the rope he just bought he either dragged her body further into the field or left her in his car to leave somewhere else. It would have made the most sense to leave her, but I think she may have been found already if he did. Anyway, about the time he got to point 5, he noticed that her phone was in the car, possibly because of a text or call coming in, and he smashed it. In case it was tracked, he didn't want to leave it where it last worked, so he threw it out several miles down the road. From there, he just continued on his way home, and dropped her off somewhere else along the way if he hadn't left her in the field or with the phone. He threw the gloves, hat and sunglasses away, along with any excess tape and the rope.
A clerk at the truck stop told LE that a man had bought those things, but couldn't give a very good description of him, and definitely not enough for a sketch. What they're looking for now is anyone who was at the truck stop and saw someone putting those things into a vehicle, hoping to get a better description. They're most likely also looking for anyone who saw a strange man fitting the vague description around the car wash at the time she ran by, anyone who saw a car stopped on 385th & Historic US 6, anyone (especially from the farm near the corner) who saw a car pull off the road, and anyone who may have seen anyone unusual at 200th and 385th.
The end? MOO