User blog comment:Soulreaper1234/Why does Urahara Kisuke hid the Hogyoku inside Rukia's soul?/@comment-1961713-20100512025338

but then I also think the Hogyoky is some sort like a bait and a poison too, only Aizen thought it is a very powerful orb and would benefits the subduer... still we need more proofs to back our claims though