You can only be the 'Super' champ or regular champ. Kessler can't be both.
If Kessler fights Mundine and wins he is still the 'Super' champ. and the regular champ. is vacated/there is none until a new fighters earns the shot at the title in which in this case that fighter will go direct into. fighting Kessler (if hes still the Super champ.)
Regardless of how they paint the picture it's still a crock of shit!! IMO and it more sanctioning fee$ for them and it just makes the sport more irritating.....

Soon the IBF and the IBO will join in and have 'Super Duper' champs.