"If you cut down Cook's compensation a little bit, everyone else at Apple could get a couple percent raise."

Or they could use the money they have and give everyone including Cook huge raises. Or cut everyone's pay and make their stuff cheaper. Or pay their suppliers 20% more. Or put a huge check in some charity basket. Statements like these are pointless.

I'll suggest that it's very likely that Tim Cook would have never come to work at Apple if they paid executives 40-60% less then they do as you suggest. And that would have been a net loss for Apple.