Fans think of the Broncos ' group of quarterbacks as a trio .
Really Broncos 's a sextet -- Manning , Osweiler , Dysert , Knapp , offensive assistant Brian Callahan and quality control coach Bo Hardegree , quarterbacks all .
Fans think of the Broncos ' group of quarterbacks as a trio , but really it 's a sextet -- Manning , Osweiler , Dysert , Knapp , offensive assistant Brian Callahan and quality control coach Bo Hardegree , quarterbacks all .