The Chiefs are the NFL's only unbeaten team at 6-0 and yet, "We’re gonna be so much better. There’s so much more we can do.”

Come on, baby!” Some 50 feet away, behind a closed single door, quarterback Patrick Mahomes is standing at a microphone in a press interview room. After an up-and-down day — his own — he’s talking about how the NFL’s only unbeaten team,