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How does a GM know if a certain player is going to effect the team on and off of the field? Certain players could help a particular team on and off the field. This is what a GM looks for in a player whether or not they can perform on the football field and effect the locker room environment. GM's are not just looking for a player who can perform but also be a leader that others can follow.
An example of this is Kam Chancellor, who is a tremendous player for the Seattle Seahawks. As stated by his current teammate Earl Thomas stated, "He has so much experience, he has become an incredible leader off the field. Everybody’s morale was just high with him out there with us." Chancellor is a very important player for that organization and the GM is more than willing to give Chancellor more money and bonuses because of Kam's workload and product he has produced.
However, some players have proved to desire more money than they deserve. For example, Jay Cutler of the Chicago Bears. In his career in Chicago, Cutler has only one postseason win, against a team that had a record below .500. Also he is getting paid over $120 million over a 6-year deal. He hasn't had any breakout seasons, even when the team acquired Brandon Marshall, and Alshon Jeffrey, who both are phenomenal receivers.