If he left the child intentionally because he was late and then "forgot" you would think that when he remembered he would have ran as fast as he could out to that car and got his child out as fast as he could and called for help. He didn't. I'm not buying the forgetful nonsense.
Say......say he got distracted by Whisper while at CF,lost track of time, was running late, and took Cooper to work and left him in the car.
If his goal was to make a show of being on time, then his mind hasn't moved on to work, he's making an appearance and then going straight back out.
But he doesn't. Approximately 12 minutes go by after he gets to work. It would be one thing if evidence showed that something unexpected or urgent happened during those 12 minutes that was work-related, or even that his boss was watching him and he didn't think he could walk out after just getting there. Something, though those 12 minutes of leaving Cooper alone in a closed car stretch long even with a "reason" for them. Already, what in those 12 minutes is more important than going back to his son?
12 minutes after he left Cooper in the car pass, and if something or someone had prevented him from going back out, that's no longer a factor, because after 12 minutes he begins texting again with Whisper lady, and keeps on texting for the next 10 or so minutes.
So, if he originally meant to go right back he didn't, for no discernable reason, and 12 minutes later he is not rushing out to reassure Cooper and drive him to daycare, and he's not even texting about sex, he is replying to Whisper's comments about her husband and KIDS and he types out.." I LOVE MY SON..."
Forget whether he could forget his son in 2 minutes while the daycare building is literally staring him in the face. The question that stretches credulity past the breaking point is--is it remotely believable that ONLY 12 or 15 minutes have passed since he's left Cooper in the car intending to go right back out but has forgotten, texts are exchanged in which children are mentioned and "discusssed" and he says MY SON and he doesn't remember right then if he had somehow forgotten? And freak and run?
Here's a nasty possibility. Maybe he meant to go back out but didn't hurry because he didn't have a problem with leaving Cooper in the car, LeAnn did. And maybe as he texted Whisper he needed an escape it occurred to him...maybe I just won't go back out. And maybe he texted the same thought twice within a very short time (in a text exchange of very few lines) "my wife doesn't like me going out with friends," because the first time was a complaint but by the second time, it was part of an "alibi" or scenario he was starting to work out.