Because the rape victim hired legal representation yesterday and her attorney told the D.A. she would cooperate fully and seek full prosecution.
That's not language that suggests she is going to recant/change her story, or decline to press charges.
The incidences of players being reinstated quickly have all occurred when the victims decline to press charges or don't want to cooperate in the investigation. All indications are that the victim in this case is doing the complete opposite. That means a lengthy investigation, and AJ not being back on the field in the next 2 weeks.