I read that too. VERY interesting, to say the least.
I was at Fort Riley at the time of the bombing...you may remember that McVeigh had a lot of connections to Fort Riley. I know three people who were questioned, under suspicion of being John Doe #2.
Anyway, I emailed Jayna Davis about the people I knew who were questioned...and the very clear indications that the FBI genuinely believed there was a John Doe #2. She actually e-mailed me back with a nice note.