I've never believed that that was a pure coincidence either, and I think that first letter to American Media is the key to the entire case.
EXCLUSIVE: How the FBI Botched the Anthrax Case
http://www.abcnews.go.com/Blotter/Story?id=5276220&page=2
written by an agent assigned to the case - he seems to blame “inexperienced management” - comforting to know that the FBI didn;t have anyone with experience to assign to the investigation.
No mention of the spore science which is the key to everything.