Don't own Bleach
Flashback - Just after Utsumi left the Soul Society
Aizen had walked around the Soul Society basking in his victory. He had outsmart everyone. Aizen had proven he was the smartest in the entire Soul Society. No matter what anyone else thought, he won. His experiments were significant to the future evolution of Shinigami and Hollows. His plan to reach a benevolent race is slowly coming together. Ichimaru and Tousen had done exactly as he said. To Aizen this was what he wanted out of these people, not someone to continue to question him or bark orders at him. He wanted someone to do as they are told and these two carried out the role perfectly. He smirked, having obedient subordinates was a nice feeling to have.
It was the middle of the night and he had called to meet Ichimaru and Tousen in the forest behind Sokyoku hill. They were there as they were told to. Ichimaru with the smarmy grin of his and Tousen with ever-present stoicism. Aizen knew that they were the perfect duo to help him reach his goal. Tousen was easy to manipulate with his goal for justice against Central 46, all he did was promise to bring the Soul Society to its knees. Ichimaru was a little more difficult, so he played on his ambition and cut throat nature, saying that he could have the power to destroy the Soul Society himself.
Tousen and Ichimaru looked up at Aizen's arrival to see him with a smug look on his face as he approached. "What did you need us for Sosuke?" Tousen asked.
Aizen looked at them with his brow, judging eyes, "A Shinigami left the Soul Society today. Unauthorized, no doubt sympathizing with Urahara and the other experiment subjects." He informed them.
Ichimaru was first to respond, "Ain't that something the Head Captain has to worry about?" He asked
Aizen shook his head, "Yes, but we need to be prepared for when he comes back. He will be back looking for something, anything to prove Urahara's innocent. He may not pose much of a threat but we have to end him when he comes back."
Tousen argued, "Why would he come back? He's escaped, why would he bother coming back for someone he doesn't even know?"
Aizen regarded Tousen for a moment, "Because he will compulsively do, what he feels is, the right thing. He will do it because he feels he must."
Ichimaru snickered, "Fool, I will just have to cut him down." He said laughing.
The glare he got from Tousen was enough to stop his laugh, "Don't be foolish Gin, why do it yourself when every other Shinigami will want to take him down? It would only draw attention to yourself." he retorted.
Aizen had enough, "It doesn't matter, he won't be able to do anything. He'll be a minor pest. One that will be exterminated by the Gotei 13." He said arrogantly. "Then we just have to bide our time and we'll be more powerful than any Shinigami and any Hollow." He boasted and left.
Ichimaru and Tousen bowed as Aizen took his leave. They watched him go, walking with an aura of confidence surrounding him. Aizen had given them the opportunity to become powerful, more powerful than either of them have dreamed. The experiments had been a means to an end. The Shinigami they used had to be sacrificed in order for evolution to take effect. It was all done for the greater good.
Tousen looked to Gin, "So Gin, do you really think that Aizen is right and the man who left will be back?" He asked out of curiosity.
Gin's face never changed, "Ain't got a clue. It doesn't matter, I heard he was only a Third seat. He left his Squad after his Lieutenant, Lisa Yadomaru, was used in the experiments. I don't think they were close but I guess he couldn't handle the pressure and he snapped then left." he explained
Tousen nodded, "It doesn't matter either way, he goes against us he will die."
End Flashback