When Mark Singer began writing his book Citizen K, he generally believed the claims made by TDPK. He learned his lesson. Chapter 35 is devoted to the differences between the stories Brett Kimberlin told and those of other witnesses.
Once I compared Kimberlin’s renderings of certain incidents with the recollections of other witnesses, the recurring theme of “jumping the connection” almost always emerged. When a dope dealer jumped a connection, he eliminated a middleman, hoping to cut his costs without increasing his risk. Now, both literally and figuratively, it seemed that Kimberlin has this same habit. Figurative instances were narratives in which he claimed center stage, though in reality he’d participated at a distant remove or not at all. Or, when it suited his purposes, he might do just the opposite, ascribing to others acts he in fact had performed himself.
Given the behavior I have personally witnessed in Maryland and Virginia courtrooms, he does not seem changed.