Good cover corners make offensive lines work longer. By the end of the game those average pass rushers will find a foothold to exploit.
If you ever played football you will know that defenses, especially the rushers DL and DE, expend much more energy than offensive linemen. Thus you will see a lot of DL rotation going on.
And by the end of the game
everyone is tired. Including those average pass rushers.
No my point was about time Kam. To an NFL quarterback time is life's blood.
And to NFL secondaries too much of it means certain death.