My big problem with analyzing any of this is that I still don't see a reliable particle size distribution analysis of this anthrax powder. "Smoke" is typically just over .5 micron. Cab O Sil fumed silica is 0.2 - 0.3 micron. I don't know anything about anthrax soup. An Aerobell can make 2-3 micron direct droplets readily that shrink as they dry. The satellite droplets are usually a third of that, which you could then air classify (which isn't too bad if you don't care about yield). Of course, containing it well enough to stay alive through all that is another matter.
A few details would be helpful.
From USA Today
http://www.usatoday.com/news/nation/2008-08-13-anthrax_N.htm?csp=34
WASHINGTON — Former Senate majority leader Tom Daschle, whose Senate office received the first anthrax-tainted letter in 2001, says he is satisfied the FBI has found the culprit.
Daschle, a former Democratic senator from South Dakota, called the Justice Department’s case against Bruce Ivins, an anthrax scientist at Fort Detrick in Frederick, Md., “complete and persuasive.”
“I think the evidence is pretty compelling,” he told a group of reporters at USA TODAY’s Washington bureau.
...
The most compelling evidence Daschle heard was that the DNA “fingerprint” of the anthrax could be traced to a flask controlled by Ivins.
“That’s as close to a smoking gun as I think you’re going to get,” Daschle said.
_____________________________________________________
The best thing about this article, the title,
“Daschle buys Ivins as sole culprit in 2001 anthrax attacks”
I think there’s some editorial disapproval in “buys”