I do understand what a copyright is, but how can one copyright something already copyrighted?
His is clearly a copyright of this  |
Your argument is not valid. That's like saying it's not illegal to rob a bank that has already been robbed a few days ago.
A head that has been used by an admin (even if they're ex-admins) can only be uploaded by someone else is given permission to by that admin, even if it's just an edit.