Cleveland wunderkind LeBron James is moving to the top of the top of the depth chart in terms of sports superstars, a field that has become less populous after the travails of marquee players like A-Rod and Michael Vick. James, who dropped 55 points in a victory over the Bucks Friday night at the Bradley Center, seems capable of handling the task. All he needs is to win a title, stay out of trouble and remain in Ohio.