I'm rewatching Platoon's videos about EDG's champs win, and just theorizing... is it meta to swap your IGL with an initiator/flex/easy to drop into role, and keep your IGL as coach/assistant coach? Haodong swap with S1mon was exactly this.
You need the IGL to help the team build strategy and cohesion and adapt to a meta. You can't not have an IGL at all, but once the team is comfortable, your second caller can probably handle it because they just have to copy what the IGL was doing. As long as you used to have an IGL, and maybe keep that IGL as a coach, you can swap without disaster.
Teams should try this. Boostio, Boaster, FNS etc. should stop playing before/during stage 2 and just put in someone else until the end of the year, then swap back for the next year/meta.