If you have a base and you add members there is no Main member anymore. So if a player is additionally registered for a base, they will henceforth have the same rights as the founder of that base. But that means the newly added player can also deregister the owner?!!
In principle, it’s good to allow other players to use your base, but there absolutely should be different levels of access rights, such as Admin and User.
The base owner should ALWAYS retain admin rights for their base! That way, if a player turns against the owner, they can’t simply deregister the owner, leaving the owner without access to their own base.