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Originally Posted by Souzouryoku

I don't think this needs to be in spoiler tags but...I'll just do it anyway..

Spoiler:

Was Urahara banned because he created the Gigai or Hyougyouku?!

Also..Aizen definitely said "At the time he chose to hide it in you, Kuchiki Rukia. But, when I found out about this, you had already disappeared into the material world." I thought the Hyougyouku had been hidden in the Gigai given to Rukia by Urahara. BUT, if she had it before she went to the material world, then how did it come to be inside of her? Especially without her knowing? So confused! o.o

Well...since you asked in spoiler tags, I'll reply in spoiler tags.

Spoiler for manga explanation:

According to Aizen's explanation in chapter 175 of the manga, he was banned for the creation of the Gigai.

"However, in the past, he created a Gigai completely undetectable. And for this, he was exiled from Soul Society. There is another reason for why he was cast out. The Gigai devoured the spiritual power of the Shinigami. Because of that, the Shinigami using the Gigai would never recover his/her power. The Shinigami's coordination with the Gigai diminishes and eventually that Konpaku would become powerless."

So it seems that the Hougyoku was placed inside of Rukia before she had to use the energy devouring Gigai. After all, if the Hougyoku was hidden within the Gigai, all Aizen would have had to do was get Rukia to be brought back to Soul Society, remove her from the Gigai, then claim the Hougyoku. But it was inside of Rukia, hence why he needed to extract it from her with that device that Urahara created.