Anyone who finished the Arrancar Saga knows that Aizen got one-shotted by Ichigo, then sealed by Urahara and imprisoned in Muken for 20,000 years. And yet, when you think about it — he won.
No, he didn't achieve his grand goal. He never became the new Soul King and didn't even reach the Royal Palace. Yet the changes to the Gotei 13's old, rigid system took place anyway.
The Soul King was replaced, just as Aizen wanted, and perhaps in the future another, better way of replacing the linchpin will become possible.
Yamamoto died and was replaced by a more progressive Head Captain, leaving the Gotei 13 with no original members remaining — the old Gotei is gone.
There was a technological boom in Soul Society thanks to Mayuri and Urahara working together again.
The Royal Houses — at least the Kuchiki clan — seem to have become less traditional, as Rukia's marriage to the low-born Renji didn't draw much attention.
The Central 46 was entirely replaced, and its decisions were influenced by both Ukitake and Shunsui, which suggests less centralized power and more flexibility within the institution.
The Visored were accepted back into the Gotei, Arrancars helped during the war, and even some Quincies aligned with them — all signs of a shift toward a more open-minded, inclusive, and less antagonistic structure within the new Gotei 13.
Things changed slowly for the better, without Aizen ruling over reality. Instead, Ichigo's bravery and self-sacrifice influenced the people within the system.
So Aizen remaining imprisoned feels more like his own choice than a punishment, as though there is no longer any need for him in this reality. The systemic change he wanted is happening at its own pace, and his goal has lost its meaning because Aizen himself has changed — influenced both by Ichigo and by his own defeat.
He lost, yes, but that defeat was exactly what he needed in order to confront his own flaws and internal contradictions.
During his sealing, Aizen is at his lowest, all his "godly" powers begin peeling away. He realizes he is not going to evolve into anything greater, and he fully understands that he has lost. At that moment, all his anger and despair resurface.
And that becomes the transformative moment for him.
He is forced to look beneath all that control and beneath the cold, collected facade — and it's an ugly, very human picture, but it is exactly the mirror he needed. Only then can he begin to understand himself without illusions, facades, or self-deception.
The evolution tends to look ugly, after all.
(A shoutout to this beautiful post by @cheese183818 who explained it better than I can. Go read it!)
To sum up, Aizen wins something important, he gained the mental space and time to self-reflect and accept the part of himself that had been deeply neglected through years of pretending, living a lie, and detaching himself from reality and from the people around him.
We know that he succeeds in this self-discovery because he is one of the only two characters shown to have fused with their zanpakuto. And from Ichigo's story arc, we know that this kind of integration is not only about power — it is about embracing the parts of oneself that were feared, hated, or misunderstood.
So in the end Sosuke Aizen won himself. And that is the most important victory anyone can have.
Shinichi: *points gun at the thief holding onto the hand of the clocktower. Looking beautiful yet sharp as his hair flowed from the wind, smirking as he balanced himself on the helicopter.*
Kid: *stares at the beautiful detective, a slow and helpless grin spreading across his face despite the panic he felt at the gun*
What if the FGT didn't drain Ichigo's power, just knocked him out a bit? What if they thought he'd lose his power, maybe thought he HAD until he woke up because he was beyond their ability to feel, then they realized?
What if C46 got super nervous and demanded Ichigo be sealed with Aizen?
These two are cell-mates for two years. They talk, come to understandings and agreements and more, and then Yhwach struts in and neither of them are having it. At all.
Ichigo's restraints are quite a bit looser because the captains argued for leniency and have been on a mission to prove Ichigo's safe so they can release him, and Aizen can/had advised Ichigo how to loosen them further to free himself and he does and curb-stomps Yhwach while Aizen watches with mild interest, casually messing with Yhwach's sight to make Ichigo's fight easier.
The invasion halts, people come down, many thanks are given.
Ichigo's given the option of freedom because that proved him safe, but he's like: "I'll stay with my cancelled husband."
Over those two years, Aizen can probably spill the beans about what Ichigo actually is. Although it won't be as, ahem, "heartfelt" as Isshin's chat.
I would add one caveat though. Because I am a ruthless woman and I loves me some carnage as much as I fucking hate Yhwach;
Ichigo asks Aizen, as politely as he can manage, how does he destroy Yhwach in such a way he can't come back? Which involves some good ole fashioned butchery with a dash of Hollow reiatsu to work like acid. By the time people come to check on Muken, all that's left of Yhwach is a rapidly dissolving head. Even that fades into the memory of history.
Ichigo and Aizen greet the bewildered stares with a bored "What, like killing him was hard? Also, could someone get a bucket and mop? That blood'll really stink up the place if you let it dry."
Another thought about Aizen's inner world inspired by this picture
See ,in the background there's a road that leads inside a forest right?
What if his inner world is a staircase to (heaven,pun intended) to a temple high in a bamboo forest and at the top there's a shrine where Kyoka suigetsu lives
I think something like that will tie everything together
His loneliness at the top, his desire to reach above and beyond,his superiority complex!
And maybe near the shrine there's a little pond or something where there's always a reflection of the moon but no moon at the sky
( in this version it's always night,but strangely enough a light source exists somehow)
I believe Kyoka suigetsu simply hasn't revealed her true self to him yet due to trust issues and that's why there's a moonless sky
Maybe a few months into his imprisonment in Muken Aizen keeps getting lost in the forest or he is climbing up the stairs but to no avail,later though he realises his mistakes takes the opportunity he has been given (unlimited space and time with no distractions) and mends his relationship with his zanpakuto and that leads to him becoming EVEN stronger in the TYBW!
The guy literally perfected his powers!!!
Anyway that's a theory an Aizen theory, thanks for reading
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