Since there has been discussion about theories I thought I would throw this one out.
I looked up JMW's mug shot from this website:
Sex Offender Archive Records Nationwide
His employment says: RLH Sealcoating 1970 Old St RD 44 Martinsville, Indiana. Don't know when he was employed there.
When I looked up about the company it is listed under paving and construction. Since there was a lot of construction across from 5N when LS went missing it would be interesting to see if the company was doing work there and if he was doing work there.
If LS was able to walk out of JR's, maybe he was there and exposed himself to her, hence the scream. It was reported that someone (don't remember who) heard a scream around the same time. Knowing he had a record and didn't want to be caught again he abducted her and got rid of her. Just thinking out loud.