Exactly - we don't need to know at all. In fact it is probably best to respoct Satoshi's anonymity. If he wanted to reveal his identity he would have done so long ago. However he hasn't, which suggests that he won't reveal it anytime in the future.

People say that satoshi has a million coins, but this is just pure speculation as lauda said. Apart from the public infromation that is available from the blockchain there is really nothing else that can prove it.

Bitcoin is running okay without him, why do we even need him back now?