Olof brings fear to the opposition man, kio does not. Olof is a "heavy weight" even if he does not play in his role like in fnatic days, even if he is not 2nd awper anymore and starplayer like in fnatic days. Olof had to change his gameplay to play in FaZe. The team had 6 months when they clinched their first big LAN event, also, they got 2nd in a major when they did not have like even 1 year together. FaZe with olof is much stronger than with Kio... ffs. Kio is t3, olof is t1.
last but not least. If olof ever comes back FaZe will clinch everything. You can see how they are developing without him, imagine when he comes back. FaZe team knows olof is a big legend in the scene and his presence alone gives them confidence. Olof is the biggest dog in FaZe, even if he is not the best player/fragger.