It wasn’t like there weren’t any other cultivators available. There were countless cultivators who wanted to enter the system.
The key problem related to the rules of recruitment. Each domain couldn’t just accept anyone. They usually didn’t dare to simply accept cultivators of unknown origin because once something went wrong—such as recruiting spies from other nations; the person who made the recommendation would take the blame. Hence, unless they had a really had a good relationship with each other, they usually wouldn’t recommend just anyone to join.
Thinking back, Cao Dingfeng had first recommended Miao Yi’s entry into Transient Light Cave, purely because of his good relationship with Chen Fei—he trusted him. Following which, it was because Cao Dingfeng had put in a few good words and asked Cave Master Zhang, that Miao Yi’s name was added to the registry records. Only then was Miao Yi able to join Transient Light Cave.