Apple had one in Scott Forstall and Tim Cook fired him, in the name of furthering "collaboration" at the executive level (whatever that means). IMO that was the singular event that defines Apple in the Tim Cook era.
My take is that Cook intends to coast at Apple until his 10 years are up, managing operations well but not taking any risks, and removing anyone who would take risks. It's an acceptable strategy, but it's just not what we're used to from Apple.
So, like another commenter said, I agree that it's mostly an expectations problem. It's not just that Steve Jobs and Scott Forstall are gone, it's that Apple, under Tim Cook's direction, has made a conscious decision to be a different kind of company.