I am thinking like you... she would have crossed the road if she saw a car parked.
Here's the thing. There really isn't a place to park near the path across the road without being part way in the road.
If she crossed the road, that means he would have had to cross the road, then drag her back across and into the path. He would have been seen for a long distance by a car passing, if he did that. It would have also increased the chance that VM would have seen him crossing to ambush her in her peripheral vision.
Combine that with Kickoffs post about why the SUV doesn't fit being parked there, to me, either there were two perps, (one got dropped off and waited for her) the SUV wasn't involved at all, or as kickoff said, he left on foot and came back and parked...another huge risk.
JMO, neither a torch was used, and after seeing how fast those running shoes burned, neither was an accelerant.
Edit:
Just to add. after seeing the black smoke from the running shoes burning, that explains the soot on those logs.