Mack Brown, do us a favor and quit shifting the blame to your assistants. Do the right thing and step down. It would appear that you are failing in recruiting the top talent and in being able to motivate both coaches and players. Your are the leader so try taking responsibility. Changing defensive coordinators is not going to make you a better leader. To the powers that be at UT, either kick him out or give him another 10 year contract and double his salary.