CFHSW, he participated in climbing the rankings very early, this is an example. I understand that the matchmaking is random, somehow he can always meet a lot of high elo people in his matches.
Why are there people with low winning percentage, very few matches but high elo?
I take as examples Meltdown (OU season 15's highest win rate to date is 86.50%) and CFHSW (66.67%). These two players have almost the same number of wins and elo but their win rates are very different.