I'm a cowboys fan and I like chip kelly. I think he is a good coach but the nfl is a mans game. In college you can have maybe 25% of your roster that will make the nfl. In the nfl though there isn't many weak links so what happens when your offense doesn't pick up a few first downs? You get top in the Cowboys game at 42-18. That is insane for a defense to be on the field that long. Can't have that and be successful long term. I know he wants to run up tempo but their is something to be said for keeping your defense rested. Case in point from cowboys game they came back to take the lead 24-21. The Cowboys drove right down and scored a td. Then another. Their d had no gas left. I think chip needs to evaluate how fast he wants his offense to go