Renck: Bo Nix has always given the impression that he is serious, so when it popped on the Jumbotron during a fun fan feature that he would be an FBI agent if he weren’t playing football, it came as no surprise. He is not a class clown. He is a coach’s son who is as disciplined as a monk and reserves smiles for victories, not small talk. It is paying off. Through eight games, Nix boasts the best numbers by a Broncos rookie quarterback, including a franchise-record five wins. “That’s cool,” Nix told me.