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Per Chris Johnson of GiantsFootballBlog.com, part of the problem for Bennett in his time in Dallas was his attitude on and off the field. He was accused by many for not having a great attitude about being a backup, and he made Cowboys fans sick with all of his ridiculous YouTube videos.
That's all behind him, and with a chance to be a starter and a huge piece to what the Giants are going to do this season, he will get his act together.
Not to mention, joining a team that has had success winning championships generally changes attitudes for the better. The Giants, in particular, are a team full of veterans who will not take any nonsense, on or off the field.
According to Michael David Smith of Pro Football Talk, Bennett did make headlines when tight end coach Mike Pope revealed Bennett weighed in at 291 pounds in May's minicamp, but he insists it is because he has been killing it in the weight room.
Despite that, I believe Bennett will change for the better and have a good season for the Giants.