National analyst: Cubs will contend by 2016

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Jim Callis, of, explains where the Cubs four, young hitters rank among the best group of hitters in a minor league system he’s ever covered, why CJ Edwards has been so successful on the mound, when he expects the Cubs to contend and more.

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Kris Bryant takes batting practice before the game Friday, July 12, 2013 at Wrigley Field. (Brian Cassella / Chicago Tribune)

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