Keiko initially wasn't much interested in the soul society and its aspects of the storyline which involved Ichigo and his adventure but after discovering Hogyoku and it's a reality-warping ability which could make that a person desires into a reality, he was very interested in seeing Ichigo group, Ichigo in his Hollow form and how much control would he have hollow's in that form, Yasutora Sado in seeing that if his powers are taken away how much the exposer to him a normal human would change him, and lastly and very importantly Orihime Inoue her powers were very unique and if utilize could be very useful in any world.
The secrets hidden behind Orihime's powers were also one of the reason's why Keiko knowing the real storyline was utterly disappointed in Aizen, he simply user her powers and didn't even try to understand the basic concepts behind it.
The suspicion which Keiko was under would automatically go away once the plot of Aizen and his Hogyoku are revealed in front of everyone, after which he will be completely free and resume his activities. He had already decided that he will create his Bankai after getting a certain Item from a certain world which he will use base while adding different items of his own.
Right now, Keiko finds himself in front of Captain-Commander Yamamoto who asks him: Why are you here? No need to pretend everyone has already left.
Keiko smiling replied: You should know, I can simply kill my way into the soul society and take as many Shinigami I want if that's what I desire. But now I'm brought here against my will in regards to something I didn't do so you can understand If I'm bit pissed right now don't you dear old man?
Captain-Commander Yamamoto: So you think someone has deliberately brought you here. What will you do next?
Keiko: I already know who wants what from me, All I will tell you is that old man you need to be careful. Someone is pulling from right under your nose.
Captain-Commander Yamamoto: Someone is a traitor upon my ranks? Who is it?
Keiko simply smiled at him and turned around to leave.
Yamamoto understood that Keiko is simply here to play and nothing else and asked: Call it a curiosity of sort but I wonder why you chose division 4?
Keiko stopped and without looking back answered: I learned how to heal myself only because I want to fight for a longer time.
Without exchanging any more words, Keiko simply left Yamamoto in his thought process and went to meet Ichibe who was talking to one of the longest-serving captains in Gotei 13 and Keiko's new captain Retsu Unohana.
Keiko first greeted Ichibe then Retsu who gave him directions to the 4th division and left to let Keiko and Ichibie talk alone.
Ichibe: Kid what is your angle here? I don't understand why you chose to come here. If you want we can leave right now I will handle the rest.
Keiko: Don't worry I have thought it through, I come here to prevent conflict from escalating we both know the struggle between Royal guards and Center 46 would have been bad for us in the long run so I came here just as insurance it's not like I don't have the king's key and can't return immediately in case of emergency right? And you should know better than anyone else that they are very few people who can fight against me and almost no one who can catch me so Don't worry it will only take few years I think, in the meantime, I suggest you start strengthening the royal guard in case something big happens here. I will keep on sending reports every week regarding the situation here. For now, I need a small piece of cloth from you with a seal on it.
Ichibe: I understand your point of view but if you were their main target then you have just walked in the mouth of the tiger. I will work on the royal guards and be ready for everything I will also let others know of your concerns. Why do you need a cloth with a seal on it?
Keiko: I have always told you to keep your friends close but your enemies even closer thus I came here but immediately joined division 4 which I don't think anyone could have anticipated and by now one who hatched a plan against me would have probably started rethinking their plan. I want to seal my eyes to train my other senses life is boring with eyes.
Ichibe listening to Keiko felt that there was much logic behind his words and felt Keiko has decided after a lot of thinking thus decided to leave it at that, ripped a small piece of cloth from his white clock and activated his Bankai to form a seal on it, instructing Keiko to supply some of his Reiatsu into the seal so that seal follow his command gave the seal cloth piece to Keiko who smiled and covered his eyes sealing them while activation his observation Haki.
Ichibe seeing Keiko fine said goodbyes and left for Soul King palace again.
Keiko smiling disappeared and appeared again in front of the Division 4 headquarters. He went in, seeing different people getting treated using Kiado methods smiling he raised his left hand from which around 60 rays shot out targetting all the sick people waiting for treatment closely the sick people started healing their condition started improving at one. Retsu Unohana along with her lieutenant Isane Kotetsu was surprised at the sudden ray of light but then they saw the condition of the patients improve at a visual rate regardless of their condition or state. Retsu moved back and show Keiko standing there with only one hand in the air and seeing him healing people didn't interrupt the process but watched everything from the sidelines. After 3 minutes everyone in which the ray consumed were healed completely. Keiko lowed his left hand while raising his right hand and rubbed his back hair while introducing himself: Keiko, the Swordless titan the newly added member of division 4 reporting for duty.