CYA if you think about it how much could have gone on without him knowing every little detail.
Him saying that is probably SOP to every answer he gives when dealing with his subordinates after all the crap they pulled behind everyone’s backs for political reasons.
yeah, just in the context of a smoking-gun type letter it seemed to indicate a lack of confidence in the letter. As you note, I may be reading too much into it. It would depend on part if this type of hedged answer is typical for tenet, something I don’t know.
Alter Kaker has a thread:
http://www.freerepublic.com/focus/news/2056952/posts?page=1
about this new book.