Translation by Pikeish написа:

Asashiro/Aizen conversation:

"I'll ask this point-blank. Why did you kidnap Inoue Orihime and confine her 
in Hueco Mundo? You knew you could release the Hougyoku by yourself.
 Or is it so that she had some hidden power still?"

"You should already know the reasons for that though? 
For me, after I was able to achieve that one thing, I've 'released' her you know?" 
(meaning he's made her 'free' after he was able to lure the captains into HM)

Aizen returns the question as if testing him. When Azashiro remained silent, 
the one who commit high treason, with his thin smile still on his face, continues his words.

"If you hate unnecessary things, then you should make your questions more direct, Azashiro Kenpachi."

With a figure as if he can see through the heart of Azashiro who doesn't change his expression, 
Aizen continues his words, enjoying it. 

"You didn't ask me this question because you are cautious of Inoue Orihime right? 
What you were interested in was in regard to the man who calls himself
 'Kenpachi'. Am I right?"

 "I will not deny it. To be honest, it was because I found the information regarding the man 
who lost to Kurosaki Ichigo defeating an Espada in Hueco Mundo to be mysterious."

Azashiro has affirmed it indifferently but it wasn't like he has expressed everything he has felt. 

"Sine being defeated by Kurosaki Ichigo, unlike Kuchiki Byakuya who has been training day and night, 
Zaraki Kenpachi has only done his free exercises/duel in the 11th division barracks." 

In a manner as if he was provoking him, Aizen started talking about this 'Zaraki'. 

"Zaraki huh.... Indeed, the greatest "result/effect" Inoue Orihime's existence has brought about 
was isolating Zaraki Kenpachi in Hueco Mundo"

"What are you... saying?"

"You don't know? That if Kurosaki Ichigo went into Hueco Mundo by his own decisions, 
I knew that Soul Society will hasten the arrangements to send its captains. 
And, as I have estimated, by dispatching Zaraki 
 at the very beginning, I was able to quarantine him. The other three are merely secondary results"

Azashiro slit his eyes at the words being spoken smoothly. As if trying to distinguish whether 
Aizen's words were truthful or were only spoken in order to perplex him. 

"I'll say it bluntly. From all the captains, who I've decided would be hindrances were 
Yamamoto Genryuusai Shigekuni and Zaraki Kenpachi, those two. 
I've decided I shouldn't fight him until I was able to awaken the powers of the 
Hougyoku and attained an immortal body."

czeliate@NF написа:

The 8th Espada’s story .

A long time ago there are 2 brothers. The elder brother is chief of army while
 the younger brother is an alchemist.
The elder brother defeats his enemies during the battle, he then brings his defeated enemies 
to his younger brother and serve them as a “material”
As time passes, the younger brother has treated numerous human as a material for his experiment.

One day, these brothers suddenly dies and became a hollow.
The younger brother saw his own rotten corpse when he became a hollow, he was very excited.
As a result, he ate his elder brother and other souls that he was experimenting.
Later, he continues to eat other hollows and finally became humanoid, he took down Vasto Lordes.

The name of the younger brother is : Szayel Apporo. During the battles he often limit his own strength
in order to capture a live “material” (capture something live and treat as a “material)
Hence, he accepted barragan’s call/invitation and became a researcher.

Later he became a member of Espada that was created by Aizen, his number is “0”, 
which is the strongest among the espada. However, Aporro still not satisfy with it, 
in order to study the perfect of life, he complete his “Annunciation” power and separate himself into 2, 
successfully degrade himself into an Adjhucas. 
The other separated body is Grimmjow’s fraccion- arrancar no.15 (illforte). 
As Aporro degrade into an Adjhucas, his strength declines substantially 
so he was detach from the group of Espada.

However, after completing the secret technique of reincarnation call “Annunciation”, 
he regains his position back as an Espada and was given a No. “8” 

In the end, he was defeated by Mayuri and falls into hell.