You know if you think about it this all comes back to one issue and that is the aggravated child abuse charge. Aggravated child abuse is the piece that holds the charges together and rules in or out lesser charges and felony murder.It was the gateway to everything the prosecution argued and once the jury did not find evidence of that everything else unraveled and fast.
No abuse means impossible to find guilty on:
felony murder
first degree murder
second degree murder
aggravated manslaughter of a child.
The prosecution could not argue both manslaughter thru negligence and manslaughter through aggravated child abuse and they opted for the latter.
There is only one remaining lesser charge, which is manslaughter through culpable negligence. But in order to convict on that, they would have had to buy into the accident theory 100% and that is a long shot at best. There was no proof of it at all because the prosecution did not present any. Obviously they didn't present it because it would be counter to their stance of premeditated murder and they would have been arguing against themselves. There was slim to no chance of a conviction on something that the state didn't even argue.
So,there was no where to go but "not guilty" once they determined there was no evidence of aggravated child abuse. This right here is the key to the verdict imo.
Jury Instructions for reference