Well, of course he had to develop Tom. Frodo and Co. couldnt have met Mr Enigma, for then he couldnt have development of all. So while Tolkien created him as an enigma, I believe that he developed his character to be an enigma, also. So he is Enigma-twofold, in his literary concept, and actual characterzation. There can be no rebuke against his literary standard.
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HONDA GL500