P.J. Walker struggles — and Bears’ rookie QB doesn’t — in loss

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Bears quarterback P.J. Walker throws a pass against the Colts on Saturday night.INDIANAPOLIS — A broadcaster once asked former Colts offensive coordinator Tom Moore why star quarterback Peyton Manning’s backups never practiced. Moore’s response, with the curse words edited out, was this: the Colts were in deep trouble were Manning to ever get knocked out of the game, and he didn’t want to practice with his team being in deep trouble.

The Bears are nowhere near that point yet — putting quarterback Justin Fields and Manning in adjoining paragraphs, much less the same sentence, is not meant as a comparison. But the message, in the same city where Moore once worked, is identical: if Fields…