It does not matter much what other top MBA's with Chinese citizenship achieved and lost. You need to be yourself and control your own life within your capacity (if you want). Everyone has his or her unique life track. You analysis is meaningless and somewhat superficial.
"MBA不教创业,也教不了,我一直很怀疑MBA的作用,这就是个专门培养高级打工仔的地方" - I think maybe you are right. MBA is just a degree itself. How to utilize it and what it means is a very personal thing. Every CEO or most Chairmen are GAO JI DA GONG ZAI as you defined, especially if they are working in public companies. Do you prefer to being a CEO (from a DA GONG ZAI's track) in a Fortune 500 company or being a boss of a small business which has a great potential? I think each option is good. And it's very probable that the CEO was a boss of medium personal business before and the the boss who's currently operating a small business will take a leading role in a MNC. Broadly speaking, everyone is a GAO JI DA GONG ZAI in his or her whole life, no matter whatever you become.