Since Kisuke knew that it'll take a while for Ouetsu to finish his research and reforge the Zanpakuto of everyone who switched bodies, he took his time to track down the movements of both the Seireitei and the outpost in Hell. And thanks to Kaname Tousen's information, he was also able to locate the exact spot where the [Chained] gathers. Kisuke wanted to figure out how exactly Szayelaporro was using the [Eyes of Hell] and maybe get an idea of who was the mysterious being that Kazui met for him to have access to Hell.
'It could have been the lingering power of the Soul King because it looks like something he could do... But I still don't have any evidence to prove that.' Kisuke is considering the possibility that they may be another powerful being that he's not aware of and could derail everything he's working on, 'Though what I really need to know is the owner of those eyes, not who has access to it.'
Within an enormous castle which the [Chained] gathered and reside in, Kisuke covered himself with an invisibility cloak that he made to hide his figure and his aura. If he's in the previous worlds, even someone a level below Riveria before she became a Devil, they would be able to detect him if he's close enough. But without systematic knowledge about Magic and zero experience in Ki, there's no way he'll be found if he's careful.
Kisuke had been stalking the castle for the past few days now and he had already taken note of everyone's movements. It was then that he figured out that everyone who participated in the Hell Invasion were all who were in Szayelaporro's group.
'According to Furoufushi-san, the original Captain of the 9th Division, Kumoi Entetsu-san is one of the [Chained] but he's nowhere around. And the only other notable Espada who's not with them are Coyote Starrk and Lilynette Gingerbuck.'
Kisuke removed Ulquiorra Cifer's existence from the equation due to the nature of his death.
Coincidentally and fortunately for Kisuke, when he was roaming around, he also found out their plans to attack the Seireitei outpost in Hell and eat the souls of their victims. Thanks to that, Kisuke was able to finalize their schedule of their own attack, '9 days from now on, huh?... I guess we still have plenty of time. Once they're all gathered, it'll be easier to clean them up.'
As he has done with what he needs to do in this castle, Kisuke decided to leave and set more countermeasures in case something goes wrong. At that moment, he caught sight of Kenpachi Kiganjou and wondered how someone like him survived among these cannibals.
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Within the deepest layer of the Seireitei's prison only reserved for the worst of the worst, Aizen opened his single eye that's not blindfolded. He only had to wait for a few seconds when a Magic Circle appeared in front of him and Kisuke's figure materialized, "I was expecting you. What do you have for me this time?"
Kisuke didn't say anything and stared at him, 'He was just exposed to Magic a few times but he can already accurately feel it? Is it because of his [Evolution]? How frightening. It was really a miracle that I was able to seal him.'
Kisuke continued to stay silent and took out his Tenshitai (Divine Transfer Body) and waited for a minute or two before taking it back.
"They left, huh? It would have been nice if they said their farewell on their way out." Aizen, who also waited alongside Kisuke, first said.
"Urozakuro must have offered you a way out, right?" Kisuke sighed while taking out two seats and a table.
Aizen wondered if Kisuke was expecting someone else, "I have no reason to get out of here. And the moment I do, the monk will just humiliate me as I am right now."
"That's true isn't it... Yhwach only managed to win because he had the power of the Soul King, which is the only being he can't forcefully name." While answering, Kisuke placed two cups and a kettle filled with tea on the table.
Not being able to contain his curiosity, Aizen finally asked, "Who else are you expecting?"
Kisuke, once again, stayed quiet for a few seconds while staring at Aizen before bringing up his right hand and snapping his fingers.
The sound of the snap resounded through the empty space but Aizen didn't care about that as he could feel the binds that confined him slowly loosen up and the Reiatsu that couldn't go out started spreading out. A few seconds later, the last harness that was keeping Aizen attached to the pillar unbuckled and he dropped down to the ground.
Aizen didn't immediately move and checked the seal on him and found out that he had the same freedom from when the Quincies invaded Soul Society. He then started walking towards the table and sat on the chair Kisuke prepared while saying, "The only reason why Kyouraku felt confident letting me go at that time is because he knew he could seal me back before I could completely recover my power... But it looks like you have no intention of doing that. What are you trying to achieve here?"
"I'm just trying to set up an honest talk between us." Kisuke answered while pouring the tea on both cups.
Aizen became silent to contemplate, 'He's already under my ability and I could manipulate his perception from here on... But this is Urahara Kisuke. He must have already put countermeasures in place before releasing me.'
"When did you tamper with my seal?"
"Please, I devised the seal on you and no matter how the Seireitei modify it, they can never change the underlying locks. It already had several backdoors from the beginning."
Aizen recalled the moment he lost the Hougyoku's power and chuckled, "I'm impressed with your recklessness despite the situation back then."
"I couldn't have gone this far if not for that."
Aizen picked up the cup and drank the tea. It was the first time he tasted something other than blood and dirt for a long while so he savored it. After a few sips, he brought down the cup and asked, "I won't be fighting for you. Not when you're trying to change the whole world in your own image. People like you are the one I hate the most."
Kisuke took a sip of his tea and replied, "That's too bad... Really."
"So what exactly are you here for? If you want to take out that monk, I doubt you'll need my help."
"Before we proceed, I'd like you to watch something first."
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Half an hour later, Aizen started laughing out loud, "Fuhahahahaha!!! So it was not Kyouraku who you are trying to get in contact with! He was just conveniently there to receive you!"
With a big smile on his face Aizen asked, "I still won't fight for you since it's still going against my principles. But I can offer you my assistance in the other areas."
Kisuke grinned, "I'm glad that you're easy to talk with. I just want you to assist in creating a giant hole."