I've seen it happen, experienced it, I know RNG plays a role in getting teammates and all... But, I've also heard that you can sometimes nail the same group teams by joining all at once. But I don't know if that is a myth or not. I've tried reporting once or twice because of this very same reason. People will AFK, or just sit there for a spell and wait it out so we all rush in and get hammered hard. It can get ridiculous but the occurrence has been rare for me thus far in ranked. In casual it happens more than I would be comfortable with. So I've been avoiding CC for the last day or so.