Cowboys went out of their way to make him inactive most of season. Garrett/Marinelli were both big on practicing well to earn playing time. If you put that together you can infer he was not practicing well. From what we heard about him in college he can get down on himself fast if things don't go well at start. People who followed him in college warned about how important it was for him to start strong or he would loose confidence/sulk if things were not going well. I think you have to give him atleast 1 year of that type of immaturity. If he exhibits same attributes in year two it will be his final year in Dallas.