Additional Grants To SuperUser?

I created a role named 'carlos' which is my current user account with
'superuser' grants but my question is when I look at 'postgres'
account, he has additional grants that I don't understand.

            List of roles
 Role name | Attributes  | Member of
-----------+-------------+-----------
 carlos       | Superuser   | {}
 jmadeline  | Create DB   | {}
 mwilshaw  | Create DB   | {}
 postgres    | Superuser   | {}
           : Create role
           : Create DB

So from what I see above, 'carlos' is a superuser but do I need to
grant him 'CREATEROLE' & 'CREATEDB' rights along with 'SUPERUSER' or
is 'SUPERUSER' by itself good enough?