Champion Mastery grades still unclear
http://i.imgur.com/ULbENr3.png
I know grades are based on comparisons with the rest of the people who play the champ. That's also what this comparison does. Is this just a "Third parties aren't representative..." type thing? Because when I saw "A" for this Lucian game, it didn't make much sense, especially with how much weight is seemingly put on CS.