ririmu theory is that aizen just wanted to be a normal shinigami and connect with other people, but he was too lonely and that twisted his own ambitions, so he ought for becoming a god not as his primary goal but as a bad step to cope with his loneliness, and having fought ichigo served as a catalyst and forced him to confront those feelings and realize that power isn't what he actually wanted, that kind of superior behavior he has is a defense mechanism to distract himself from the pain of being alone, and all he wanted was friends, that loneliness aizen felt was made worse because all the people that followed him, including the espada, were weaker, her theory is that Aizen kept gin around and was so focused on ichigo because he was secretly waiting to have someone so strong to finally destroy that isolation, and that was his true desire instead of just power