User blog comment:Zwann/Vasto Lordes in the Espada, let's analyze./@comment-1590714-20091017103645

@ Grimmjow2, Yammy probiably didn't even attempt to release because of his own charasteristics, by which I mean that he is way to arrogant to release against such a "weak opponent". Also, his size change can be explained as Nakeem Greendina (one of Grimmjow's fraccion) did the same thing in the Human world, leaving at least myself to believe that it has nothing to do with the quality of the Reishi in Hueco Mundo. I believe he could've released anywhere. It could also believe there might have been an order from Aizen not to release, for strategic purposes.

To Minato88: No problem, I actually thought nearly everyone had noticed already?