Merit is exactly where we're disagreeing, but not about the merit of the work or lack thereof. What I'm saying (and largely, I think, agreeing with you), is that if he was enforcing his contractual rights, then he was exactly correct. If, however, he was trying to take credit for a decision that he did not make, all contractual rights aside, if he wanted to make people think that all the greatness of that episode sprang from him, then he would be wrong. He deserved the payment and the credit (by law; this part has nothing to do with artistic merit); he did not deserve to say "It was great, and I am the sole reason why."