By this logic Apple should have fired Steve Jobs right after his return when he started negotiating with Microsoft for the investment that would save the compan

By this logic Apple should have fired Steve Jobs right after his return when he started negotiating with Microsoft for the investment that would save the company from going bankrupt in weeks. Only he was in a position to do that negotiation and the negotiation was necessary, so he was indispensable and "should be let go" before things got worse? This rule of thumb sounds like madness to put it bluntly.