Yes! Fontelle needs her Man to come home! I've been scouring that area's maps, and really, while there are a great many places Bob could be, there's also a limit to where he could be, given the timeline. IF we believe it was all done at the same time, that is.
It's still possible that Bob lay somewhere close to the house waiting to be taken to his final destination. We only have Jeff's word that he didn't know Agnes was coming. He could have returned in the middle of "whatever" to let her in, played with the repair scenario a bit, Agnes cleans, Agnes leaves, and Jeff locks up, and leaves. He finishes "whatever", and goes the rest of the way home. That is, if Jeff is the culprit.
I don't like the 330 route, but it's still doable, if things weren't done all at the same time. What bothers me about the 330 route, is that posters have said a lot of bodies have turned up along that area throughout the years. The killer would know that. I would think something a bit off the beaten path is a bit safer for all involved. I mean, 330 would definitely point to a particular family having been involved.