I don't think it's a waste of time, for the call to MW's number alone. But I don't think Jersey took BL. I think trying to make him fit as the lone abductor is an exercise in futility. . .it just doesn't fit.
All MOO. . .but after looking at the neighborhood crime map that Indepmo provided. I think DB could have had MW's phone number, and here's why. There were quite a few thefts. In Aug, we know the DB/JI had a car break in. It looks like their neighbors had one on the same night. I think if somebody broke into your car, and you found out somebody also broke into the neighbors car, you would talk about that. In fact, this summer, my 3 neighbors to the north all had car break ins in the same week. When I learned of it, I told my 4 neighbors to the south about it. . .so they could be careful, keep an eye out, etc.
Soooooo. . . .IF Jersey was suspected at all in these break ins, and I imagine he was, it is possible that somebody at the Lister house got his contact number from a neighbor, so they could see if whatever was stolen showed up on Craigslist. It's what people do nowadays when they have something stolen.
It also could just be to call him up and confront him at some point, but I like the first explanation better.
All MOO. . .MOO. . .MOO!