If your system of rankings is not bad then I put forth a test

I will give a few hard stuck silver and gold players plat to diamond accounts and i will bet that they can pull a 50 percent win rate by simply existing. I bet they will also crush in some games too.

I believe the system atm allows really bad players to grind up to around diamond 5 through sheer number of games and boosted accounts to stay at the boosted mmr as long as the person isn't too terrible

My evidence for this is a silver 5 player friend of mine whos brother boosted him to plat and now hes slowly CLIMBING and even has games where he "carrys". this is a guy that cant even carry normal games or even avoid going 0-7 in them half the time.

your system is horrible and needs a massive overhaul