I think @MWollaeger is objecting to the idea that the IC has to impact all of the OS characters instead of just the MC (right?)
I never thought it was a thing that the IC (as IC) has to create conflict/impact everyone. I know that Jim’s approach to creating an IC throughline when writing it to just create an impactful character (not thinking too much about the specific impact on the MC). But I didn’t think that meant the IC has to influence everyone.