MOUNT VERNON, Texas — To most people, Mount Vernon, a city of 2,500, was just another dot on the map. That is, until about a decade ago, when something big came to town. “He stands out wherever he is,” said Mount Vernon resident Pam Greenberg. “Think of the size of this man.” “He’s just a normal guy who happens to be 7-foot-2,” resident Ronnie Davis said. Greg Ostertag won a state championship at Duncanville, reached the Final Four at Kansas and twice faced Michael Jordan’s Bulls in the NBA Finals.