Think about how much MCBU could be worth as an independent, without the burden of Chevron Management and processes. Lower drilling costs, lower opex, less red tape. Heck, it could double its Proved reserve base right away by following standard industry practices instead of being controlled by the incompetent twit running Chevron's reserve gestapo.
That would also give JW more time to focus on his "big hitters" like Big Foot, Gorgon and EGTL.