There absolutely is "relative to position" in WAR. It's in the form of positional adjustments. A player is credited or debited a portion of his WAR based solely on what a replacement level player performs at his own position. This is misleading if you're looking for a comparison of the best players, as a player should not get awarded or penalized based on what other players do if your sole aim is to determine who the best player is. If you're measuring "value," then absolutely WAR is a great measurement. But positional adjustments should not be a part of the calculation of you only seek to know who the "best player" is.