Tyler Smith has developed into an All-Pro left guard and is often mentioned among the best players at the position. This past season, however, the Dallas Cowboys had to ask Smith to move to the outside and play left tackle. That led to some debate since their current starter at the position, Tyler Guyton, has yet to live up to expectations. Dallas Cowboys guard T.J. Bass jogs onto the field before the game against the San Francisco 49ers. Cowboys can't gamble with the left tackle positionDallas Cowboys offensive lineman Tyler Smith against the Philadelphia Eagles at Lincoln Financial Field.