Perhaps he didn't claim authorship of the "The Oily Rigs" because he didn't write it?

Subject: RE: how important is the label traditional singer?
From: Captain Birdseye - PM
Date: 03 Oct 07 - 01:01 PM

I have never been convinced that Bob Roberts was a Traditional singer

Subject: RE: how important is the label traditional singer?
From: Captain Birdseye - PM
Date: 03 Oct 07 - 05:52 AM

of course Roberts is another grey area being both a traditional and revival singer]

Now who would imagine the same person wrote both those statements?