Point guard (PG), also called the one, play maker or "the ball-handler," is one of the standard positions in a regulation basketball game and is commonly abbreviated "PG." A point guard has perhaps the most specialized role of any position – essentially, he is expected to run the team's offense by controlling the ball and making sure that it gets to the right players at the right time. Above all, the point guard must totally understand and accept his or her coach's game plan; in this way, the position can be compared to a quarterback in American football.
I would say that definition accurately describes what Lebron James does. I know he is listed as a small forward, but as we know from Duncan's listing as a power forward, those terms are not always accurate. Lebron James runs his team's offense. In the past people have called the position "point forward" for players such as Grant Hill and Scottie Pippen. A more fine tuned argument would be that a team can not win when their best player is short.