Castle Entertainment Co. made a contract with Justin Timberlake to star in Castle's upcoming feature film, The Boy Band. The contract between Castle and Timberlake prohibited any assignment of rights or delegation of duties without the written consent of both parties. Shortly before the film was set to begin principle photography, Justin Timberlake received another offer to shoot another movie that paid twice as much. He decided to assign his rights and delegate his duties to Ben Affleck. Castle sued Timberlake for breach of contract. Timberlake defended on the ground that he validly assigned his rights to someone who had more bankable star power and was most likely going to make Castle even more money on the film. Who wins and why? Your answer should discuss whether and how contracts may be assigned and delegated and whether this was a valid assignment and delegation