"Perhaps not," he said.

Aizen, having greeted the new scientist that would be infesting the laboratory complex he'd had his eye on, decided that it was high time he returned to his notes.

"Anyway," he began, half turning away from him to head back into his office. "I shall leave you to your ...work."

And he would not forget to threaten the Arrancar with death, or worse, should they speak to this man on matters concerning their creation.