Ever since Heavenly Citadel was built, many guilds had sent in spies. Everlasting Heavenly Legends being the first guild to have headquarters, this was an expected response. Both John and Jeanny knew they surely had spies in their members. There was no way to prevent this. What they could do was simply keep these spies from entering the core member circles where more valuable information was circulated.
Many guilds had given up trying to have their spies enter the core members. John and Jeanny kept a tight leash on the selection process. So, they just left one or two spies to keep tabs on Everlasting Heavenly Legends' general affairs.