Re: Wait a minute.
I'm sorry, I thought when you wrote that Peter David "didn't seem to have any official position," you meant he'd expressed no position except the words you quoted. Apparently your point was that his earlier, more specific words didn't spell out exactly what he'd consider fair use.
Of course, fair use is a deliberately misty part of copyright law that depends a lot on context, so David couldn't spell out helpful guidelines for us, especially in regard to work owned by other copyright-holders. All that's already been said.