John Calipari hits the whistle again, not out of anger or impatience but mere practicality. This is how it has to be today. For the Kentucky Wildcats to practice effectively once they get through Friday night’s Big Blue Madness celebration, they must learn how to practice. Calipari is starting over again. His first team at Kentucky relied on four freshmen in its primary rotation. The top three scorers on last season’s team were freshmen.