Okay, I’m not remembering that movie well enough to really comment.
But, I’ve never thought about the IC that way. I think of the IC as someone only seen from the MC’s POV, so this idea doesn’t really jive with me.
The IC is also, just generally, part of the movie in the OS. Is that not enough? Or does their trouble have to emanate from their domain?
Put another way, don’t Marta’s MC actions to protect her mother also cause problems in the OS? She’s destroying/hiding evidence that the detective might need…