I would say, rather, couldn't do it. Tolkien the nitpicking perfectionist would definitely revise, often to a fanatical extent, to make things consistent; but catching every detail in that massive manuscript, from memory, was beyond him (or any mortal). And so there are inevitable slips (like the phase of the moon over Nimrodel, or Shadowfax' speed relative to normal horses).
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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