On 1st and 10, if the offensive tendency is to run between the tackles, a coordinator might call 4-3 Cover 2, Wil A (in this case, Wil A would be the Weak Inside Linebacker blitzing through the A gap).
A defensive scheme includes all components of a defense, choreographed in hopes of stopping an offensive tendency. On 1st and 10, if the offensive tendency is to run between the tackles, a coordinator might call 4-3 Cover 2, Wil A (in this case, Wil A would be the Weak Inside Linebacker blitzing through the A gap). This would fill almost every running lane on the snap of the ball.