How Substantive is Holder?

Powerline, " Is Eric Holder being candid about his relationship with Governor Blagojevich?":

Holder's claim that he never performed substantive work on the Gaming Board investigation does not appear to be accurate. In response to a FOIA request, the Office of the Governor of Illinois has produced a letter of April 2, 2004 from Holder (on Covington & Burling letter head) to the Chairman of the Illinois Gaming Board. The letter begins by stating, "As you know, Governor Blagojevich has appointed me to investigate issues relating to gaming in the Village of Rosemont, Illinois." After informing the Gaming Board Chairman that "the first stage of the investigation will fous on reviewing documents," Holder proceeds to request the production of ten categories of documents.

I guess it depends on what the definition of substantive is. But then Holder was schooled in the Clinton White House.