One often overlooked aspect of both quarterback play and offensive line play is setting protections, checking to the right calls versus certain blitzes, and making sure everyone is blocking who they’re supposed to.
Everyone remembers the Peyton Manning return game in 2015 where he entered the Chargers game and a few plays into the drive checked into a run call against a blitz look that scored a touchdown, and never looked back.
That’s the intangible effect a quarterback can have on an offense. Additionally, the quarterback’s relationship with his center and being on the same page with him is another crucial piece of that puzzle.