I've watched recent matches for a month or beyond for all teams besides Grayhound and Furia. Teams like EnVyUs haven't had matches before the Minors with their exact lineups, but regardless I watched each of them and despite a few people passing expectations (Winstrike for instance) I've been majorly right on how I've predicted things.
The strongest teams in the main qualifier are: NRG, ENCE, NiP, Cloud9, Fnatic, AVANGAR, Vitality, and anywhere between ViCi, G2, Winstrike, and Spirit.
Expect those teams as the favourites for the qualifier, as for myself I'll be putting NRG (With other close contenders being NiP and ENCE) to go 3-0, NiP, AVANGAR, ENCE, Vitality, Cloud9, Fnatic, and ViCi to progress to the next stage.
My 0-3 pick will be either Tyloo or Vega Squadron, they haven't been practicing and have been looking extreme shit in the past 2-3 months.