Does the creator of BitCoin hold a 'master' private key? If the creator of BitCoin, whoever he/she is, was the one that started the block-chain and with every cryptographic operation deriving from that initial key, would the network be under the complete control of the creator? The only way I could see this not being the case if the key was disseminated into the network, but I am unsure if that is the case.
If the key is control over the block-chain and if the key generator still holds the key, then regardless of the fact that it is decentralized in operation, it is still centralized in control, like a bank.

Any thoughts?

Update: 

I guess I'm really asking basically is whether the creator had/has any advantage in the network (i.e reversing transactions, creating new coins). I mean unless he specifically programmed the network not to be under his control, it would be right? I mean he IS the creator of the network and unless we have proof (source code inspection?) that the network has been 'turned over' so to speak to the users, we cannot guarantee safety can we?
No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" was the alerts system, which allowed signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue.  This feature was for alerts only and can in no way affect the blockchain, transactions, or user balances.  This key was possessed by Satoshi, Gavin Andresen, and theymos.

Update: The alerts system was retired in the summer of 2018, due to risk of DOS attack vectors (full nodes could be DOS attacked by carefully crafted alert messages), and increasingly widespread knowledge of the alert keys.