Group leader bring the party member leave while the game start

while the competitive just start if player leave while the game just start and the game will be end and the leaver will get double derank and get cooldown for comp**(I think every player know this**)

So what am i gonna to say is if the group leader of the game leave the game while the comp just start he is possible to bring his teammate leave the comp along him and make his group mate get punishment I feel this is unfair for this

In my opinion blizzard should give those leaver join back the game and make the comp run normal if he able to join back he game (not like current if the game start have player leave and will be countdown a few second and the match will be cancel and the leaver get punish even he able to join back the game)