you also have different types of teams. Steelers play the run game meaning that the QB of any Steelers team will only throw for one TD a game sometimes 2. other teams like the Colts or any teams like them they throw for 3 or 4 touchdowns a game. In point his stats might show less TDs thrown but check the teams stats. they score TDs without putting the ball in the air. They are also a big defense team. top 5 rated defense almost all the time. we score more points on defense than offense sometimes. You need to look at the style of football the team plays