Wang Linchi quickly extracted plentiful intelligence from this man named Shidai, a Remnant of the Hundred Beast Sect.
Shidai's situation was rather tough; in fact, all Remnants of the Hundred Beast Sect fared poorly. As defeated combatants, even if they were incorporated, their status couldn't be changed, and others deliberately exploited their lack of background and power.
Thus, over the years, many disciples of the Hundred Beast Sect who had been incorporated either perished or became incapacitated within a decade. Only a small fraction, like Shidai's group, managed to survive and live slightly better.
As for how they connected with the Elders and Deacons in the Beast Garden Secret Realm, it was naturally through internal connections within the Sects.