Changing the administrator's account name is just adding obscurity to the system. This can confuse some hackers, but it will also confuse everyone else. The documentation starts needing qualifications (using "admin or the equivalent user" or somesuch). It increases the amount of information you have to pass on to later administrators, and leaves one more piece of information you can forget. And changing usernames in Linux is not a good idea, because it messes up all sorts of things -- UID is not widely used, username is the more common way of identifying a user.