He had been at Yamabuki Chidori's side for years and had long since grown used to her occasional off-the-wall remarks.
"Oh, right. Since this is a captain's assignment, someone should monitor it." Something suddenly occurred to Yamabuki Chidori. "Have Aizen Sōsuke do it! We can trust him with this!"
Kuchiki Kyōka nodded. "Rest assured. I'll have Aizen Sōsuke monitor Kyōraku Tōshirō and Kensei Muguruma's assessment right away!"
As for why Yamabuki Chidori had chosen Aizen...
Aizen: Was that really necessary?
I personally named Kuna Shiro as someone to save. Little Aizen, I hear you're the King of Hueco Mundo. Surely this isn't beyond you?
If Kuna Shiro dies at your hands now, just see what I do to you.
The moment Kuchiki Kyōka sent the assignment, Aizen went on alert. What does Teacher mean by this? Why does he want me to monitor Kensei Muguruma and Kyōraku Tōshirō? He obtained Kuna Shiro's file as quickly as possible and found that she was merely an unremarkable new Soul Reaper.
"She's just a new Soul Reaper. Why send two captain candidates to rescue her? And Teacher issued the order personally, then asked me to monitor them? Could it be... he's found out what I've been doing in Hueco Mundo?" Aizen felt a twinge of guilt.
"That shouldn't be possible! I've been extremely careful. I shouldn't have been exposed!" Aizen could not figure out what Yamabuki Chidori was thinking, but one thing was certain: he did not want the Soul Reaper named Kuna Shiro to die.
Aizen contacted Salkapolo in Hueco Mundo as quickly as he could. If anyone had thought to abduct a Soul Reaper from Soul Society, it was probably Salkapolo.
"Lord Aizen? What can I do for you?" Salkapolo asked respectfully.
He had watched Aizen rise to his current position