User blog comment:Xilinoc/Proper Trivia/@comment-3996324-20130314120428/@comment-957629-20130315133232

No, the law was that ranks 4 and above were not allowed to release their power inside of Las Noches hence he, being the one who obeyed Aizen's every demand, went above Las Noches!! 1-3 released whilst in battle with the Gotei 13, they were not inside Las Noches!! Yammy didn't care and he didn't destroy anything inside it anyway which, given the ranged abilities of the other 4 top Espada, they would have destroyed a lot!!