That's exactly what I thought about the license plate, whoever was driving was NOT Bob, not in the hornet, but had the plate covering their own, might have ransacked the house in Bob's car (Just that house? Were others burgled?) , said "looking for Bob" as an excuse, went to the tower and tossed the plate.
As for Edwards, this was EXACTLY when he was killing. Ohio, August 8, 1977 or thereabouts (bodies found August 8)
Convicted Killer Pleads Guilty to Slaying a Norton Couple in 1977
Bob missing Sept 17, 1977.
Then the sweethearts here, 1980. So sometime between 1977 and 1980 he was in Wisconsin for sure, since he's been confirmed to be the killer of the sweethearts near the concord house in delafield.
Bob, if murdered by him, would have been right after the first killing and before the 1980 killing. 0.0