I disagree. Just coz he kicked karrigan doesn't mean he has a big ego. Everyone knows karrigan's calls weren't working out for FaZe. So, he had too. And it is always a team decision. No one can just kick any player in the team, that too IGL, just like that. The other possibility was to add IGL, which they did as Neo, but that didn't work out too. Aleksib was an option and I think it might have been a good decision but maybe his playstyle doesn't suit FaZe's.
Moreover, rain is doing a decent job. olof is the problem. He is playing bad roles but it doesn't mean u lose all duels. He barely managed to get a single kill on CT side Nuke. NaVi exploited that fact and pressurised him continuously. That lead to FaZe getting only 8 rounds on CT side Nuke.
Maybe NiKo isn't a good IGL, but he certainly has brought FaZe to top 7. FaZe are losing close 2-1 so maybe replacing olof could be the winning recipe.