BBM
I feel the exact same way as you do. IMO the phone records establish criminal negligence well beyond a reasonable doubt. In a sense, everything else is just gravy on the phone records.
With respect to premeditation, I am not convinced either way yet. There are moments where I feel that his neglect was so prominent that it amounts to intent, but then my rational side returns. Severe neglect does not equal intent.
BBM
That's the million dollar question. Aside from the eyewitness testimony about Ross being on the phone, his records show a six minute call. Six minutes on hold under normal circumstances feels like a long time. Under the circumstances at the crime scene, it would have been an eternity. I believe that Ross did talk to someone while at the scene, but I have absolutely no theory as to the identity of the person on the other end of the line.
We don't know that he wasn't talking to anyone. No one has admitted to talking to him, but that doesn't make the call nonexistent. His phone records show a six minute call, and phone records don't lie. Within three hours of Ross discovering Cooper, Detective Stoddard was asking Ross about that phone call. I know that some believe that LE created a narrative after the fact, but the question about that phone call was posed to Ross shortly after the crime. I believe that call holds significance, but I just don't what it is. It doesn't make any sense.
He absolutely made a call that lasted 6 minutes, one that was routed to Ms. Gray's classroom. What's missing is any evidence that he actually spoke to anyone. Ms. Gray has no reason to lie, and it makes no sense that a parent or another staff member wouldn't acknowledge taking the call.
The call doesn't make any sense in my opinion only because LE persisted in their mistaken belief he'd spoken to someone.