Wolf, Gmod expects superadmin to be the top most of all groups.
Gmod, and ULX, give superadmin all commands by default.
Gmod has no clue what "owner" is, as, superadmin = server owner by default according to all other Gmod scripts internal and 3rd party.
DarkRP is the only mod I've ever see try to screw that up.
FTPje may be upset I say that, but, damnit, Gmod made superadmin highest for a reason.