Studying maps, and comparing street layout with statements from folks involved with this case, I'm rethinking some things. I feel the girls likely stayed within a fairly tight loop that started with Gordon neighborhood, with one or two quick stops in that general area (encompassing Gordon, Townsend, Wayside, Forest Park), during which VB joined them, then to A/N store (intersection of W Berry/Hemphill), then back to Gordon/Wayside/Forest Park area, then to Rachel's parents' house, via a back alley. I think quite possibly the girls were at 6th Ave about the time they should've been at the mall (and about the time others place them at Minot), and may/may not have gotten there (6th Ave) under their own steam. From there, the Olds was taken to SS parking lot, and the letter written with the involvement of either Rachel's brother or ST.
I do not believe the girls were ever at Minot that day or that Rachel's husband was directly responsible for their demise (though his complicity after the fact is debatable).
This is all speculation and one possibility (and jmo).W
What is at 6th avenue?