Scheme Wars: Cowboys DC Dan Quinn, 49ers HC Kyle Shanahan set to battle for NFC bragging rights once again | CBS Sports Headlines Scheme Wars: Cowboys DC Dan Quinn, 49ers HC Kyle Shanahan set to battle for NFC bragging rights once again The play-callers for two of the NFL’s top … Continue reading Scheme Wars: Cowboys DC Dan Quinn, 49ers HC Kyle Shanahan set to battle for NFC bragging rights once again