Who tf knows honestly. It's all about NRG's form on the day of match. In peak form they might 13-0 ZETA and BLG, but they are simply not playing good. In their current form they could lose to ZETA and to BLG again. But you never know when they might suddenly turn up
They use to improve on lower brackets but.. who knows, despite Zeta had lost yesterday, it was Fnatic, and Zeta did not play bad at all, they can put a fight against NRG