you put your team at a disadvantage by going afk for a few mins that the enemy could abuse a jg invade and take buffs/jg camps that could fuck over your intire team.
Idk what happened, but sometimes before when we remade a game, despite my allies died my LP still was kept. But wth was going on with that match... 
Only the people that afk/dc will lose LP and be counted as a leaver when a game is remade.
what???? Dc is not my fault... and now I feel remake mode is so useless.