Jake Haener makes most of competition (Article)

meily said

But then when the preseason began, and there was no script to reference, Haener struggled. He didn’t process plays nearly as fast as needed. He hunted for big plays instead of taking the easy completions.

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I can understand practicing the QB and offense against known defensive scheme. That's how you become familiar and confident working against that scheme. But in later practices, the defensive scheme should remain hidden to test recognition and reaction.