User blog comment:Yungbeatz/Do You think Isshin Is Stronger Than Aizen?/@comment-1982694-20100502231458

I remember Aizen admitting defeat as a Shinigami before trying to turn himself into what he claims is a god, so it's really likely that Isshin is stronger than Aizen. After Aizen's transformation, it'll depend, but Isshin CURRENTLY is stronger than Aizen I believe.