IIRC, it seemed to me that Kirk was to be the central character with Spock and Bones as the secondaries in GR's original vision for TOS. I couldn't blame WS, LN, and DK for wanting to maintain their perogatives and screentime undiluted if they signed up with that understanding. I can understand why the supporting actors would want more, but the deal is the deal. Of course the industry likes to create conflicts for the sake of conflicts ;/ ST09 did a great job of making Kirk central with Spock and Bones secondary while reintroducing the other characters briefly and in very positive ways.