I think this concussion bit is getting a little overblown. No, you don't want to have several concussions in a short time frame. But it's football, and I bet everyone who has played even four years has had at least a couple. I know I had a few by the time I was an adult, including a serious one when I was a kid and definitely one from playing football, and it hasn't had any ill effects.
Again, you don't want to send a dizzy guy out on to the field before he's recovered, but some of the alarmists would have you believe that every football player gets brain damage and/or Alzheimer's by the time they're 40, and it's just not true.
Jason Garrett offense rank minus Tony Sparano: 18, 14, 7, 15, 15