Is Disney “better off” by working with Pixar?

(a) Apply the Better Off Test to this decision–Is Disney “better off” by working with Pixar? How do you know?
(Try to provide concrete quantitative evidence to support your answer).
(b) If Disney is “better off” working with Pixar, apply the Ownership test–does Disney have to own
(via acquisition) Pixar to obtain these advantages?