The time frame is three hours... don'cha think it's just as likely the killer left quickly but at a different time? Like if they suddenly heard I was coming back, they could have run down a fire escape or something.

By the way, SJ may be shorter than Dia-chan but don't forget I can choose between two heights. If I was going to frame someone like that, it would make lots more sense to go up against the other guys, right? There's more of them taller than her, and people are more quick to believe that a man would be violent!