A nexus only strengthened Vitiate's influence over his subjects.
Before the Emperor’s apparent demise, the Empire’s greatest non-Force-sensitive combatants were selected for the Imperial Guard to serve and defend the Emperor himself. But being selected and developing into a guardsman were two different matters entirely. The Emperor chose worlds strong in the dark side for his academies–locations where his influence was strongest, where he could form a bond with his would-be guardsmen. In these academies, the candidates would undergo a relentless, merciless training regimen that included regularly scheduled battles to the death. Regardless of what kind of person entered an Imperial Guard academy, if they survived they would emerge as a honed-to-perfection killing machine molded to the Emperor’s will.
Originally posted by Azronger
Your own quote says Vitiate's influence is stronger on dark side nexi 😂Nice way to debunk yourself, lol.
Revelation is that Vitiate's influence over his subjects (i.e. Imperial Guard) is strongest in a location that is strong in the Dark Side. That is why he chose such locations as training grounds for Imperial Guard. This influence refers to strength of bonding between Vitiate and Imperial Guard. Darth Nyriss remarked that Imperial Guard won't betray Vitiate on Dromund Kaas for example.