especially if you consider something like synergy. "synergy" could be a new/special stat which raises when two players play the same game (ranked/new kind of dyn. queue). The higher this "synergy" is, the better will both players perform.
Something like this would encourage everyone to build up a roster not just by pure (the highes amount/number of ) skill.
Imo it could bring more depth to the game/roster building aspect.