FalleN and fer cases are different.
FalleN always putted enough effort to work and training. He was criticized for outdated IGLing and because he didn't want to break MIBR core (FalleN, TACO, fer) and everytime he replaced 5th player.
But seems that he overcame myself, looked at all what he did in MIBR and understood that he need to change something.
fer doesn't have motivation to play. He literally said it on his stream, he left BOOM just because he doesn't want to grind his way to top anymore. He's waiting for top offers like he's one if the best players in the world right now. Why top teams or even tier2 teams should sign such a player, who has such a big ego and just want to steal paychecks?