We have known, for a while, that every Blogger blog has to have at least one administrator . That rule is enforced by the Permissions wizard, which gives any administrator the choice to demote or remove any administrator, from the Permissions list - but only when there is at least one other administrator in the list. When the Permissions list is displayed, if there are at least two members with administrative authority, each administrator entry, in the list, has a link to demote or remove that member. If there is only one member with administrative authority, there is no such link - and that member can be neither demoted or removed from the list. As long as only the Permissions wizard is used, to demote or remove administrators, this article would be meaningless (see the above link). But, there is another way for administrators to be removed - and this occasionally leaves blogs with no administrator.
What Blogger won't tell you