they have just beaten a team with 2 subs and without the 2 best players and claiming themselves as a top regions
I guess you're kinda right? I mean, Boaster knows how to exploit their opponents' weaknesses and he certainly couldn't react or recognize them at time (that's something that NIP did throughout both maps). But I guess even if Fearoth and H1ber top fragged we don't know how much different they could've played around the team and vice versa.
a good team is one that doesnt have to require on one player to step up to win. Literally the optic vs xerxia match proved this yesterday and the guard also showed this in challengers. If they rely on derke even if they have strats to set him up, he would have to drop a multi kill every round and they lose if he plays bad