What do you call this other than luck
Take a smurf boosting someone through silver with a 90% winrate. They still lose 10% of their games. If theyre so pro, that is something.
The real question is, why on earth did they lose THAT GAME SPECIFICALLY and not another one of the 9 other games theyve played? I know its just one game out of ten in terms of probabilities, but within the framework of just this one game, why did they lose this game? How can a diamond player + 4 silver players lose against 5 silver players?
And if you do have an answer as to why they lost that game, how can you call it anything but luck? See league is a game where luck is involved if not a luck based game...