Responses
Clearly he wasn't treasured. He had a room with no luxuries, seemed to wear hospital clothes. He was merely a tool for the old man to use as he saw fit. Also clearly, he was a prisoner. He wasn't allowed out, he wasn't even allowed to encounter people outside his master's control - even the people who sought his powers never actually saw who was speaking to them through the curtains.
He wanted out, they wouldn't give it to him. Prisoner.
Even though Akito lived in basement, he was not a prisoner.
With his foresee ability, he was respected and treasured, the author should let him wear a kimono.