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The sudden availability of so much timely information about what Donald Gregg, the former CIA chief and U.S. ambassador in Seoul, once called the world’s “longest-running intelligence failure” has shaken up the world of Pyongyang watchers. Until recently, experts could say more or less whatever they wanted about North Korea, because nobody could prove them wrong. Conventional wisdom, planted intelligence, and hoary rumors have long been the coin of the realm.