Because REZ and Brollan are excellent and have both been on teams where they've been diamonds in the rough, in the sense they've been the only good player on their teams. Both incredible entry fraggers but you can often count on them both to hold a bombsite down alone, not many teams have that luxury.
Hampus has such a unique ability to consistently create space for his players, literally unlike any other IGL I've seen before, he can frag out too and although sometimes inconsistent with his calls, he can have periods of elite level calling.
Plopski doesn't even have to play amazing for them to win, as long as he pulls his weight, however he does have games where he pops and allows REZ & now Brollan to relax a little, same goes for es3tag although he does need to intergrate more aggression into his game if he wants to AWP, but he appears to be doing that now and him showing up now could be game-changing.
I mean it goes without saying that team chemistry is a neccessity but they all seem very on the same page right now and I had them as my dark horses with FURIA before the tournament. I don't think it's so farfetched now.