I agree with all your comments. But there is some reason why they have not charged anyone yet. I don’t know why that is. I do expect they will get charged at some point.
I'm no expert, but I think it has something to do with not wanting to "over charge" because failure to convict and he might walk.
I assume they will get charged too. I think in most of these situations they wait for it to blow over, and hope to do nothing. Maybe not wanting to draw the ire of the police union? Unions are quite powerful.