[Investigation, investigation, investigation. It feels like all he does anymore, but if that's what Hino needs, that's what he'll give her. He won't state his own biases outright, but he can steer Hino somewhere at least.]

It also had to be someone with a motive. It wouldn't have to be someone who would normally do the deed, just someone with motive to do so.

With whom does Castiel communicate regularly?