Allow me to disagree, but I can make an argument that East Tennessee football is more dominant than the other parts of the state. In 2006, four (4) of the seven total State Champions came from East Tennessee; while three (3) of the five public State Champions came from East Tennessee...more specifically the Knoxville area. In 2005, two (2) schools won public State Championships, with one border school, Livingston, playing in a Knoxville region, making the unofficial total three (3). In 2004, three (3) State Champions came from East Tennessee. Those records seem to indicate that East Tennessee football is certainly more successful than the two other parts of the state.
While you need not reply with your statement about East Tennessee "as a whole", remember that the winningest program in the entire state (Kingsport) resides in East Tennessee, as well as the last USA Today Player of the Year (Todd Collins, Jefferson County) from Tennessee. East Tennessee has also had more schools ranked for longer on the USA Today Super 25 list since its inception.
Add to all of this the Middle Tennessee bias that has existed since the T$$AA began operations. For further reading on that subject, just check the Mr. Football/Basketball candidates every year.