I love Gin and I would definitely love to believe that Aizen is now dead. But since Aizen knew that Gin would eventually betray him in Karakura wouldn't he be prepared? What if the second that Gin returned that Aizen initiated Complete Hypnosis? I mean he did it when hitsugaya attacked him, so why wouldn't he do it when he felt that"sense of discomfort"? If Aizen died right now, where would the story go? Gin isn't strong enough to be the main antagonist, and kubo is too conventional to make his main bad guy get killed by someone other than his main character. Aizen will probably be back next chapter and get rid of one my favorite characters. *sigh*.