The apparent distance between the girls was farther than I had imagined, as well.
I also wondered the same thing you say about the Hoosier Harvestore not having video of RMA walking, yet had the footage of the person driving at 3:57pm. We know the muddy and bloody guy matching the description was seen on the north side of the road walking west, but we don't know exactly where on 300 Rd. he was seen, east or west of Hoosier Harvestore. The fact that he was on the north side of the road sort of makes me wonder if he tried to mostly avoid walking the road and cut through the fields on the north side of 300 Rd., behind the Harvestore, and over to the CPS lot. Less convenient for him, but if he was muddy and bloody...
Jmo.