PRX didn't have something, DRX didn't know which player use, LOUD complained about infra-issues, but they were obviously on some inside turmoil. After Tokyo, FroD started to be more incisive, less started to talk less, map picks started to be drafted by coach and assist. coach... all those kind of things take a toll on team's performance and confidence.
My point remains the same: FNATIC didn't played against good teams, specially from other regions, on their peak until champions playoffs. If drx was a little more consistent, they'd swept fnatic.