Another thing to consider about the potential for an attack on Sunday: That's the same day when Tenet's resignation becomes official.
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His 2001 book, The Day of Wrath, analyzed end-times prophecy from an Islamist perspective, arguing that Jews and Christians would be annihilated by Muslims in the year 2012. Similarly, in an October 2001 “Open Letter to President Bush,” Al-Hawali expressed delight at the events of 9/11, which he viewed as a precursor to a coming apocalyptic war between Islam and the West:
http://frontpagemag.com/Articles/ReadArticle.asp?ID=14160
Is Lehman the choice? Good point about Tenet's last day, the terrorists love him!