If you manage to win the round, then they leave at the scoreboards you will still get points, I've had only 3 ppl d/c on me, one of them was not on purpose, the others cause I was destroying them 10+ to nothing
This is an age old problem in online gaming, still not even fixed in most pc online games new or old!
The best way, I think, is to just aware the disconnecting player no points and the player who remains a win. Let's remember that you don't actually "lose" any points in the game, ever. In fact, even if you lose you still gain points for playing/goals etc. So its not because if points that people d/c its because of it win/loss ratios.