I addressed why the hypothetical is limited to two options, and taking a subset of plausible scenarios does not reduce the plausibility of the selected scenarios.
Yes, because a and b represent a specific combination I said I was interested in exploring. What you've shown doesn't lower the plausibility of those scenarios. Are you being intentionally contrarian or is there a reason why you are trying to muddy a simple thought experiment?
That makes it unreal. It changed the environment too much to exclude it. Ignoring it breaks stuff. I'm not saying thought experiments are bad — do them often myself — I'm saying my response to get thought experiment itself is: it can't work like that (riffing of an unrelated but recent comment from yesterday where I'm the one doing the thought experiment as an existence proof, it's a "spherical cow in a vacuum" model).
It's not a nonsensical "spherical cow in vacuum" thought experiment to say "Pixar exists but some employees are treated bad" vs "Pixar doesn't exist". If you think that it becomes impossible for a rational mind to weigh those two choices, then there's no point in me continuing this discussion with you.
If Pixar didn't exist, the same people would do the same (or close enough) work under a different brand. Quite possibly with each other. That's as distinct as two identical dice placed in no specific order, i.e. not. Ergo, not a realistic scenario.