As the potential sources mount up they task for Fitz gets harder. The defense will argue that even today Fitz has no idea who the source was and how it evolved. Everyone is just as confused today as they were 2 years before this was intensely investigated. Is it any wonder that Libby was confused?
Yep. The defense strategy will be to distract the jury from the allegation embodied in the indictment. The defense want's a verdict on the question "was Plame outed," or in the alternative "who outed Plame."
But that is not the question.