Most likely "satoshi" is a name given for the "founder of btc" by the real creators, whoever they may be.  This way the attention is constantly focused on this one "mystery man" and not on the real people behind btc.  Also, I cant imagine one person would be willing to just keep all his millions of $ worth of btc, and leave them untouched.  Seems like the group in control of them wants to keep them untouched, so as not to hurt the fragile btc economy right now.