Every club specialized in unique roles.
For example, because of Sorrowless, Glory Capital had assembled a huge number of high-level Mages. Even Majin Temple, for the last few years, had been completely embarrassed. The quality of their Mages couldn't compare with Glory Capital, so their reputation was a bit undeserved.
Because of Lu Li, Ruling Sword was originally meant to be the dream place for high-level Thieves, but it was a shame that they had no way of reaching the apex. It was probably the damn couple that collectively covered up any glimmering potential. Who would care about any other Thieves?
Rather, it was the role of Paladins that enhanced Ruling Sword.