With all respect to Macho Harris, Kam Chancellor, and D'Angelo Hall, Brandon Flowers might be the best defensive back in Virginia Tech history.
He was a lock-down cornerback with 10 career interceptions, but he also factored heavily into the defending the run game. Flowers finished his career at Tech with 157 tackles, 17.0 tackles for loss, and 3.5 sacks. He wasn't afraid to play physically, even as a superstar cornerback, and if that doesn't represent that lunch pail mentality, then I don't know what does.