With the rules of the NBA changing at the turn of the millennium, teams have adapted, and as the teams have adapted, so have the positions. Thusly, some players are pushing the limits of their positions, redefining what is expected of them.
The rule changes mostly involved opening up the game, allowing it to be more free flowing, unclogging the paint and letting more exciting perimeter players have greater impact on the game.
As a result of these new rules, players are adjusting what they do. Point guards are more likely to drive the lane because of the defensive three-seconds. Three pointers have become more commonplace because of taking away the hand-check rule. Power forwards are stepping out to unclog the paint.
Players are doing things from positions we aren’t historically accustomed to seeing them do. They are redefining their positions. These are those players, and what we can call the new “positions” they’re creating.
Since this is all very “apples and oranges” there is no specific formula for the ranking order, but the players are ranked on how much impact they’ve had on the games in their careers, as well as how they're playing this season.