The problem with this suggestion is that matchmaking a group of players falls apart for those who are far away from the mean rank. As you rise in combat rank you will experience varying degrees of match making success, even with a perfect system that always connects players successfully. This would lead to all sorts of awkward things happening, like high ranked players not seeing anyone in starter systems, or liw ranked players only seeing other players in starter systems. You could relax the match making rules, but the effect wont go away.