As has been pointed out, the only thing over-all rank gains you is control of a strategic asset, i.e. the CV group. Since Admirals and other high ranking officers have to be generalists (no pun intended), it makes sense that overall rank be used in AH to determine who gets to play a flag officer. As has also been pointed out, stats are also posted for specific skills, i.e. fighter, bomber, and ground vehicles. Since I play mostly in the CT, rank doesn't mean much to me, but I don't begrudge that it does to others.