Almost anything in football can be viewed in relation to the quarterback. The premium positions beside the guy under center? Those who can protect him, impact him or make plays in the passing game for him. When you’ve got a rookie like the Broncos do after taking Oregon’s Bo Nix in the first round Thursday night, that emphasis only grows. “The (rookie quarterback) challenge is exciting, but it’s still, you want good quarterback play,” Denver head coach Sean Payton said Thursday night.