Come off it Hoot! McCormack has done sterling work over the years when it comes to blues research. When you consider how many really "difficult" people there are who profess to be "experts" on the blues, then I am not surprised that McCormack has kept a lot of his findings close to his chest.
As to the article (and thanks Hoot for sending me the details via email!) I find it a fascinating read. Mention is made of a book by Amanda Petrusich on the people who collect early blues 78's (many quite mad!). According to Google, this should be out in July. Certainly one to read.