Height is very overrated in terms of how it impacts a QBs vision, in shotgun. Under center most of the passing plays happen with the QB much closer to the OL. If its not a roll out, short QBs struggle to see the field from under center.
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Elway wants a scheme that fosters offensive balance. A quarterback who can flourish under center can make that possible.
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Comments from John Elway before the 2019 draft.
Under center play is a lot harder for short QBs. I think that is a factor in why he doesnt play under center a lot.