Another thought that crosses my mind is that there seems to be a good bit of car wrecks on the road they live on... If you search the news for the street there are quite a bit of wrecks reported. I'm thinking another option may have been someone stating they had car problems or were in a wreck and needed assistance to bring them to the door. IMO
This road is notorious for car wrecks and it used to be even worse. The NW part of Wisconsin is not the populated part and the state money (truth) often goes to the city areas of the south, Madison, Milwaukee, etc. where there is more population and more voters. Even Eau Claire an hour to the north has Interstate coming from MN. It is a main route as has been often noted from the Mpls/St. Paul area to this part of Wisconsin and yet it is no four lane. It used to be one lane each way all of the way. Even without drunken driving and inattentive driving and other reasons, people get frustrated they cannot pass and some do so quite dangerously.
Now to give some credit it is better than it used to be years ago, there are now passing lanes/two lanes for some stretches yet no concrete median and sometimes the extra lane is for one direction and a few miles down the road it may be for the other direction so one has to pay attention. I think there was a study and effort made to make it all four-lane which would involve bypassing etc. and some small towns argued it although there really is not much on it for towns of any size but Barron (I am talking 8 going west, not the stretch going towards Rusk County). Or maybe property owners argued it, not sure, but it did not come about but in some areas extra lanes were added, turn lanes, and so forth.
It is also not unknown for deer hits, it is Wisconsin and you have seen the rural terrain around the road. Quite common.
Just trying to give an overview with nothing else really to talk about.
It would in no way surprise me if the Closses or anyone on 8 through the years had someone at their door in an accident, etc., out of gas, and so forth.
Imagine when it was just two lane (one each way) with semis, etc. Now there are some passing lanes, etc. but frac industries have been added and dump trucks are on a mission all day long too.
I know I got a bit sideways from your question but I guess my point is to point out where people have questioned traffic on this road, etc., it is quite heavy at certain points of the day and year for sure. Even though their house is not outright obvious, the Closses lived there many years and it is not unlikely they had someone at some point that stopped for help, more likely even at night because during the day, there is enough traffic someone would see a motorist broke down and they would not have to walk to get help. Also likely they were drinking, etc. is possible, they do not want to call LE for obvious reasons.
There was a case several threads back someone referenced that was interesting. It was some young kid who I think got stuck, entered a farmhouse to get something to pull himself out, found guns, etc. Then got the family's ATV stuck, etc. Found pretty quickly he was but he murdered and had probably no intent to do so when circumstances put him in his situation.
Apologize for the rambling but I will finish by saying it is very likely the same person could see Jayme every day waiting for the bus, or getting off of it. Again it is a major route. Hardly a big town on it to speak of or almost any town for stretches, but a very major route.
ETA: Eau Claire, an hour to the south, NOT north. don't trust my memory lol