90% winrate is possible because those players never face other 90% winrate players. MMR system is made that way to put high rated players on same team,and lowest rated people on another team. Instead of Legendary players fighting each other,they are fighting low gold. I always have the same feeling about against who leg players fight. I wish there no me more duo in ranking. Also no way to change class in a match. Im very sure this top 25 will never be leg again.