I'm not saying this was an obvious fix... but...
When you have professional players not ulting on Ekko at obvious times, hitting blast cones to send you back into a team, losing team fights while having Baron, and turret diving in a clearly losing situation, I don't chalk that up to "mistakes" as the casters so bluntly put it. I chalk that up to game throwing. And when one team (that was consistently dominant all season) makes every single one of those mistakes in the final series to lose at critical moments, I don't chalk that up to chance either.
That is all. I'll take my saltiness somewhere else.