Phoenix Academy Maggie's suspicion that Aozawa was Dio sometimes wavered and sometimes solidified. Recently, however, she had become firmly convinced that Aozawa was Dio and that the series of incidents around her were all his doing.
When it came to substantial evidence, there was definitely no way to obtain it, but she had key evidence to support this idea. This particular piece of evidence came to her when Nomura True Wave recommended a plethora of comics.
The evidence wasn't the hypnosis in the warehouse. Due to Ono's uncertainty, it was difficult to determine whether the warehouse incident was hypnosis or his illness flaring up.
The key evidence Phoenix Academy Maggie believed she possessed was from the first time Aozawa spoke to her, asking if she was a Magical Girl.
If he were a severe case of someone with chuunibyo, saying such a thing wouldn't be an issue, she thought.
