There's literally no way for him to clear himself when there's no charges as of now and the investigation is ongoing.
I get what you're saying, and yes, he has an interest in clearing his name as per your other 2 points, but currently, he should have a lawyer and not speak to anybody about anything.
But hey, different strokes84 for different folks I suppose
haha, yes, but he can work on clearing his name. Its actually a valued consideration for some for peace of mind