The Chaotic Sect possessed a Third-tier Middle-grade Spirit Vein, but that did not mean that every Disciple could enjoy its benefits.
In principle, the closer to the core of the Spirit Vein, the closer the concentration of Spiritual Energy approached that of the Third-tier Middle-grade, but after all, the entire network of the vein dispersed, and the farther it branched, the thinner the Spiritual Energy became.
Hence, looking across the entire Chaotic Sect, the Cave Mansions with an actual Third-tier Middle-grade concentration of Spiritual Energy in their veins were just a few, and they were mostly occupied by the Sect Master, Inner Sect Elders, and True Disciples.