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Cousins is not the first person you would think of when the term "athletic quarterbacks" is mentioned. His 40-yard dash time was 4.91 seconds and he hardly ran the ball at Michigan State.
However, he is good athlete in the pocket and has a good sense for the pass rush. He is elusive in the pocket and is quick on his feet, allowing him to get away from trouble. Cousins will be a pocket passer for his career, so it will be key for him to stay nimble in order to get away from defenders.
His ability to extend the play is reminiscent to Ben Roethlisberger. Both players are hard to bring down and are great at making plays when needed. Where Cousins is better than Roethlisberger is that he is smart with the ball. While he is a great athlete, he also knows when it is time to give up on a play to avoid a sack or a loss and move on to the next play.
The NFL will be different for Cousins since the defenders will be quicker and harder to break away from. This aspect of Cousins' game will be the most interesting to see. His athleticism has a great chance to make him a great player in the league, but he will have to continue to work at it and getter stronger to keep the edge in the NFL.