Thats just not true, if players have a personality clash or ego difference or different playstyles its in fact NOT an IGLs job to settle that, its the players.
Im not here to show you clips of good calls, get a demo and see for yourself what loses them rounds. Again, with your own eyes, grab a demo and look at a round FaZe lose.
And for good calls, FaZe crafted two set pieces who are now common place executes (Inferno B site Molotov corner + smoke it and explode, used by Astralis and Mouz) and their T side train pistol which was used in FNATICs game recently.
More examples? Have it from the players. Rain? "NiKo is a good IGL," YNk too. Coldzera too, olof hasnt said anything, broky either and Kjaerbye agreed (rewatch streams of ESL and DH to see player interviews from FaZe, and for YNk listen to the HLTV podcast)
Want some more? Exact good calls examples? How about the games where FaZe win? All of them. FaZe win due to individuals working well together and not choking aim fights, and FaZe lose when the Individuals underperform. FaZes structure has always been good.
And the IGLs job is to be the main voice in the team when it comes to System of Play, Strats to run, Playbook, Rotations, Setups, Protocols and Map Vetoes together with the coach. When it comes down to raw aim, player responsible (obvious reasons). And when it comes down to Players Positioning - the only IGL to micromanage CT player positions is Karrigan (mouz comms). Atleast from the public knowledge, Astralis, FaZe, Cloud9, MIBR, NaVi, G2 and NiPs IGLs dont, which means players are also responsible for synergy and trade potential within each other.