I don't understand any argument for him on defense. Maybe for stretches or at some point, but you don't get a versatile, electric, and supremely talented athlete like him and not slot him in on offense. He's going to kill it in Kelly's offense, similar to what this guy did for him at Cincy:
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See what he did? Now take a kid that is talented enough to play for anyone in college football. No, you do not put him on defense.
It's that simple.