Having read most of the preceding threads (I skip a page now and then) and considered the various theories, here's mine:
I think that Jayme was the target, and that the intention was to take her and sell her into sex slavery -- possibly to a highest bidder on a Dark Web location, or to a specific individual somewhere in the world.
I think that this murder/kidnap was carried out by individuals who had some previous experience both with killings and kidnappings. I think 2 individuals were involved in the actions that night, that both wore gloves to prevent fingerprints and wore caps or hats of some type that would be most likely to not allow any of their hair to fall to carpets and the like during the commission of the crime.
I strongly think that although the actual perpetrators likely did not and do not live in the community area of Barron, they know a third individual who does live and work there. This third individual may or may not have worked at Jennie-O, but as a community member was aware that Jayme was an only child of "that age" and very likely to be a virgin still (which matters to some people), and lived with just her parents in this somewhat secluded house right on a major roadway. With just her name and the names of her parents, any or all of these 3 individuals could have looked them up on Facebook and gained a pretty fair understanding of who they were and generally how they lived. With the address and Google Maps they could have looked at the property and noted the layout generally of the house, where the nearest neighbors were, and what roads ran where.
I think that given Jayme's gender, age and coloring plus her clean all-American overall looks, these individuals either already knew or firmly believed that they could make a lot of money by taking her and selling her. The 2 individuals who did the actual acts may be members of one of the several gangs that operate out of the larger cities in Wisconsin, and this is how they have the type of contacts to arrange for sales of this kind. I also think they came from one of the cities. and this explains the "shock and awe" entrance to the Closs home and the summary killing of James and Denise -- to gang members, they were totally expendable and a fast in-and-out was necessary. If they can sell Jayme for a million dollars or even half that, they are set up for life (or so they believe ... in the real world, money goes fast).
If not currently gang members, they likely have been in the past and had participation in some events of this type somewhere.
They probably did not use their own cars or, if so, they had stolen plates to put on them. The individual who lives locally in the Barron area may have recently quit his job and left the area, or will do so when he (presumably) receives his monetary "cut" from the sale. Either way, he may still be there as he would not want to make himself conspicuous by moving very close to the time the murders/kidnapping happened.
I think that Barron was agreed upon because it's a small town and the police force doesn't have experience with these types of crimes. But Barron is pretty close to Rice Lake and Eau Claire, and they probably went first to or through those towns which are larger and provide more "traffic cover" so to speak. Possibly the FBI has been or will be parsing the Dark Web for clues that could relate to this particular kidnapping.
IMHO, the above answers all the questions about "why" and potentially "who". The Sheriff and FBI need to do background checks into the lives of any individuals at Jennie-O or otherwise in the community who may have served as the local "lookout individual" who probably has seen Jayme around the area and selected her as a good candidate and either broached the whole idea to his buddies in whatever city, or knew they were thinking about doing something like this and gave Jayme's name and info out to them.
