User blog comment:Daniel.c.c./lets take a look at power/@comment-44061-20100331025846

The concept for becoming either an Arrancar or Hollow-Shinigami Hybrid are highly rare situations, with H-S Hybrid being less likely. Seeing as Hollows who become Arrancar aren't powerful really. As far as H-S Hybrids go, to become one is a unlikely circumstances that may successfully happen or not. Both times the creation is shown they happen by chance and not on purpose. As far as the question im not sure what your asking. No Shinigami wants to become a Hollow, Hybrids gain Hollow powers, they conquer their inner hollow (mental manifestation) not an actual hollow but the driving force of the hollow powers born inside them. As shown even the powerful artificially created Arrancar are no match for Shinigami captain for the most part why would anyone want to be one.