The NFL has been transformed by the mobile quarterback.
That's true of Lamar Jackson and Patrick Mahomes, who combine passing accuracy and quick feet.
That's also true of Tom Brady, who can't outrun a Roomba.
The NFL season began on Thursday night with Mahomes dueling with another exceptional young quarterback, Deshaun Watson.
The Sunday afternoon schedule will highlight a different kind of movement. Brady will start for Tampa Bay, for the first time playing a game for a team other than the Patriots, highlighting a rare season in which a handful of accomplished passers coming off productive seasons have changed teams.
Brady left New England, replacing the productive but erratic Jameis Winston. Teddy Bridgewater, after rehabilitating his knee as backup in New Orleans, replaced Cam Newton in Carolina.
Newton replaced Brady as the starter in New England. Philip Rivers left San Diego and will start for Indianapolis.
Old quarterbacks changing teams isn't new. What's intriguing about this offseason was that each of the veterans who became starters for new teams could, with health and luck, affect the balance of power in the NFL.