Why root admin is only able to see the main default froup ? is there a way to make other admin to see default group ?

Hey , 

I observed that a root admin is only able to see the default group (Example : 'common') but other admins are not able to see this root group or group created by other admins .
So i have a two part question.

1. is there a way to make multiple root admins ?
2. how to make the root default group visible to users who all have admin privileges ?
