MS-SharePoint Site Collection Administrators
Just because one has Full Control access to a parent or sub-site does not mean that this individual will automatically see all sub-sites created under the parent site from > Site Settings > Sites and Workspaces or see all lists and libraries from a particular site (if specific access has been established for any one of those sites, lists or libraries).
Site Collection Administrators can view anything within a site, list or library regardless of any specific permissions established (from those with Full Control).
Those with proper access can see / identify / edit Site Collection Administrators by going to the very top parent site level followed by selecting > Site Settings > Users and Permissions > Site Collection Administrators – OR – from > Site Settings > Users and Permissions > Site Permissions > Site Collection Administrators.
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