User blog comment:Lia Schiffer/395: The Burnout Inferno 3/@comment-44061-20100313191650

Seals are never permanent and Aizen seems to presume to much on his ability to counter others powers. Seeing as he also was under the assumption that Wonderweiss could kill Yama and that without his zanpakuto he was no danger. I also dont recall Aizen saying forever. There are various translations but, in translations so far he either just says seal them away or seal them away so they can come out no more. Mangasteam is a bit fast and lose with translations. In any case WW is dead and Aizen wasn't speaking in long term apparently but rather in the moment. The comment was meant to address the flames that were gonna explode out of WW's body. Its too much to presume the words hold wait to that point when we don't know for sure. But seals are like barriers they can bind and the like but they can be broken, as they are used to either protect something or keep it from being used. But are commonly used when something cant be destroyed or stopped permanently. (i.e. barragan couldnt be sealed away by Hachi because kido is affected by time like all things and he erroded it with ease, just one of the few ways to get through seals. Ukitake broke the seal on the shionin shield as well.)