Board Thread:General Discussion/@comment-24996837-20140531000307/@comment-4957813-20140531003531

Askin was still a separate being than Aizen at the time Yhwach was visiting Aizen to hopefully make him a war potential. Which mean Aizen isn't on the Wandenreich's side. Plus Aizen is nearly powerless. Also, Askin's personality is very different from Aizen, and Aizen would never want to be in a subservient position to Yhwach. It just doesn't make sense for Askin to be Aizen just because they coincidentally have similar character designs.