I'm with you on this line of thought, something wasn't right about that call at all. I don't even want to imagine how I'd sound in such a situation but I'd be talking with 911 for sure and I'd sure be asking the person who was watching my child a million questions (which he doesn't do). I'd want to know when she saw her last, what she was wearing, who was at my home that night and so on.... I don't hear him questioning Misty at all, only blaming her without any info about that night (he supposedly just drove up and they hadn't discussed anything in depth yet).
The police report shows that they weren't even able to get helpful information from Ron once they arrived. They had to get all of the info from Misty.