So he realized immediately that Cooper was dead? Before he even turned around? Maybe the "premonition" that was related at the funeral about RH's dream that he saw Cooper sitting on Jesus' lap while RH played guitar and LH was surrounded by kids in a nursery came true after all.
I'm not buying it.
Let's say this was an accident. You realize your child has been in the car all day, in summer, in freaking Georgia. Yes, you'd realize immediately your kid was dead. You'd dread actually seeing him. You'd up they weren't dead. But yeah, you'd know they are...