Khalaism was something the mad one wasn't too fond of but the mad one came to an dire conclusion the mad demon within him must die because for him to evolve into something greater. Eric Zarathos must dive deep within himself and remove the madness power within him however the dark side part of him can stay the demon needed to start a clean slate. Still, Khala nor any of the other Asthavons won't be able to track or sense him anymore but the mad demon wanted something but this seemed like the only way but he would have to think of the consequences too. If he becomes a rakshasa demon then he'll no longer be a ziamichi anymore because for the first the demon has arrancar powers all thanks to his ziamichi partner and it shouldn't be this way.