It takes a certain type of athlete with the right mentality to play the cornerback position.
Playing cornerback is an exhaustive job. Cornerbacks need to be incessantly attentive to the slightest movements and change in direction from the wide receiver lined up across from them. They need to be fluid enough to process that action while backpedaling at high speeds, while also quick enough to erupt out of that motion and propel themselves toward the ball. On top of that, the player needs to armor himself with the necessary mental fortitude to rebound after a lapse in coverage and continue to attack each play with the same steeliness and precision as before.
Those that can perform all of the taxing elements of the cornerback position at a high level typically are not afraid to broadcast their superiority. The position group is known for housing the most vocal and self-assured players in football. Once they step foot on the field, they believe there is no better talent in the world that can challenge them.