This could only mean one thing: viking housewives were tidy and didn’t keep any dead Picts lying around.
I have a bone to pict with those Vikings.
There were Christian monks living in caves in Southeastern Iceland when the Vikings (or, more accurately, Norwegian explorers) landed there in the mid Ninth Century. Almost no trace of them was left behind, either. It’s either a strange coincidence, or you are correct about the neatness of Viking housewives!