A way to make AFK's in Ranked not suck

I think everyone has lost a few divisions worth of LP just from AFK teammates, so here's a solution:

If a teammate who is not in a premade queue with you is disconnected for 5 minutes or more and never returns, you lose no LP and no MMR. If a teammate who is not in a premade queue with you is disconnected for 5+ minutes but does return, you lose half the LP and no MMR. If a teammate who is in a premade queue with you disconnects, there is no effect. This is so people cannot abuse having a friend with higher LP take the penalty for their boosted friends.

The enemy team will always gain full LP and MMR, because they still had to put the effort into winning. Even if a game is only 20 minutes, they do deserve some kind of reward for those 20 minutes.