Board Thread:General Discussion/@comment-24996837-20140531000307/@comment-2211792-20140531154914

For Askin to be Aizen, that'd be a whole new level of fooling his enemies. Kyoka Suigetsu can create illusions, and it's child's play for Aizen to impersonate someone else... but that would require for that someone to exist in the first place. In other words, if there was no Askin Nakk le Vaar, a Sternritter who had received the letter D personally from Yhwach, how would Aizen convince everyone he is him? Even he cannot invent a Quincy persona and use it in a place like Wandenreich.

Also, Kubo is infamous for recycling characer designs. Similar appearances of some characters spawned theories like "Ikumi is Bambietta", "BG9 is Shawlong" or "Guenael is Souken." Sorry, it's just another Kubo thing. Askin can't be Aizen.