I'm pretty sure he's just talking about people with the potential to excel.
Originally Posted by Yazen
I'm saying he is a special war power but he's not one of the 5 that Juha is talking about. Juha already knew Aizen would refuse but thought he should try anyways.
It seemed pretty explicit to me that he was part of the five. It doesn't seem very like Juha to "try" things.