Throughout the 2017 season, the Iowa Hawkeyes primarily used Joshua Jackson as a zone cornerback. A zone cornerback can be described as a defensive back who is just responsible for a specific area of the field. Due to this, Jackson would line up on the right side of the field and about five to ten yards away from the line of scrimmage. Once the play began, Joshua was solely in charge of the area between the sideline boundary and the numbers. For instance, if a wide receiver released towards the outside, he would step to the left with his right leg to open up the hips and follow the receiver. On the other hand, if a wide receiver released towards the inside, he would let him go free and retreat to his area.
As a result of this, the NFL team who selects Joshua Jackson should primarily use him as a zone cornerback. This is because Joshua has played zone coverage for so long that it is the fastest way for him to be successful. On the other hand, if the NFL team wants him to transition into playing man coverage, they would need to give him anywhere between a couple of games to a full season to adjust to opening his hips in both directions.
Therefore Joshua Jackson could be an option to replace Richard Sherman on the Seattle Seahawks. This is because, over the past seven seasons, Pete Carroll has implemented a defensive system that is centered around the cover three defense. According to Bleacher Report, in a cover three defense, cornerbacks are told to cover the deep outside third of the field. As a result of this, they usually stand 7 or 8 yards away from the line of scrimmage and only worry about covering the area between the line of scrimmage and the numbers. This particular alignment for the cornerback is meant to give them extra time to turn their bodies to get in position to defend the potential streak, fade or stop and go route. On the other hand, the linebackers and the strong safety are responsible for covering all the short routes across the middle and boundaries. Meanwhile, the free safety is in charge of defending all the deep routes across the middle or offering help to the cornerbacks if he is having problems stopping the deep ball.