I think the biggest indicator will be if his improved mechanics hold up during the actual games with real bullets flying.  I think last year, the more he got pressured the worse his mechanics became, and he was back to his college form later in the season.  The OL will have a huge impact on his ability to develop during his second year.  First by getting the run game going with improved run blocking, and second by picking up the pass-coverage and blitzes during passing downs, giving him enough time to complete his progression.

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