If the state had the phone evidence, don't you think they would have played that card today? Send the jury home for the weekend with the evidence showing BC manipulated the phone (or fax) to call his cell phone. Or at least give scenarios of exactly how he could have done it, even though the systems don't have a history to track - or something like that.
Regarding the timeline, to me 1:00 has to work for a slam-dunk guilty verdict. Makes sense - NC got home, fight ensued, things got out of hand, etc. I even wonder if BC didn't mean to do it. Things escalated, she was injured, and then he knew he was up a creek. She would certainly have him prosecuted for DV and then he'd really have a problem with the divorce, etc. As a result, in a moment's thought, he decided to kill her.
Now, the above certainly could have happened at 4. Kid wakes up, both parents wake up, nasty comments are exchanged, and then it goes down hill like the 1:00 scenario above.