Some thoughts on Smith from Mr. Gibbs himself:
http://www.superbowl.com/insider/story/6116786
"Timmy Smith," Gibbs says, shaking his head. "He was a rookie who drove us crazy. I'd call him in my office, one on one. Most players in that situation, even veterans, are shaking. Not him. I'd say, 'If you don't get your attitude straightened out, you'll be out of the league.' He'd leave my office and say to my secretary, 'Barbara, how you doing?' Happy go lucky, like nothing happened.
"So we get to the Super Bowl and George Rogers, who started for us all season, is hurt and can't play. We have to start Timmy, and we're all thinking we're in trouble. What happened, I think, is Doug settled him down. He could talk to Timmy like a father figure and Timmy would listen. I think that day Doug told Timmy, 'This is the game we worked for all year. Get your butt moving.' And he did.
"A couple years later, Timmy was out of the league just like we thought he'd be, but the record he set in that Super Bowl is going to be around for a while."