Hi,

The problem is that the super user has Some more rights than what we Can actually See. And some rules dont Apply to them. If the Super user cannot access some thing then no other user would be able to Access that Something. So u cannot create a user that has The same power as the Super User.

I think there is some rule that makes u not able to view the other Users when you check all the groups available. TRY UNCHECKING THE GROUP PORTAL for the Admin B. then see whether you can see the other Users.