People who have high rank yet are carried (and a way to mabye change/improve rank)

I myself dont like these people because they will usually be bad (yes sometimes they do have good games) and you have the 2 types of people that always get carried in ranked. The first one is the friendly one (you always want this one) that does dumb stuff here and there but is positive and friendly. Then the person who is the saltiest thing in the world that refuse to talk to team, always splits, and feed (sometimes not all the time, hope you get the not all the time) and like when you see these accounts that are like lvl 37 and plat or something yet cant hold their own it makes me think about a way to change rank. Make it so that you earn more points on KDA not just who your up against. Make it so that promos it is based of what your performance is not who you beat and who was on your team. The reason why I just want to say this is because im tired of seeing newbies in rank thinking their hot stuff just because they got a high rank from promos yet looking at match history they have the worst KDA and bronze performance. That is all.