Without question, the Bulls' recent resurgence owes a lot to the board work of Dennis Rodman, whose 15.6 rebounds per game led the league at week's end. But one Western Conference executive believes the Worm's stats are not all they appear to be. "Look at his rebounds at home versus on the road," he says. "There's a big difference. When he tips a ball, it's called a rebound in Chicago." We checked the numbers. In 17 games at the United Center, Rodman had averaged 16.9 rebounds; in 15 road games he had averaged 14.1.