When I discussed defense and ST you ignored field position and focused on TDs. Correct the schedules aren't identical and you have to account for that instead of pretend the average exists in a vacuum.
You've ignored field position with regards to impact on yardage. Although I'm sure you'll now educate us all on how being "gifted" good field position by defense and special teams doesn't impact the opportunities to rack up yardage on offense.
Everything the offense and defense does is impacted by what the other does. They aren't playing two different games. If an offense can't stay on the field the defense gets tired and performance suffers. It goes both ways.