Life expectancy, with the best case scenario, is twelve months in unresponsive wakefulness. Otto was not totally asleep since the brain injury as that portion of his brain was not affected by the dead brain cell structure.
He was breathing. Autonomic System.
He was blinking. Autonomic System.
Otto was staring.
Otto's body had digestion. Autonomic System.
Tests were performed to measure the GI and urinary systems. Otto's body was incessantly moving about, flinching, the spasms, rigidity, stiffness, jerking, blinking, and difficult sleeping left his body exhausted. If the NKs were caring for him so closely then they realized the end was near. 12 months is the life expectancy.
The parents certainly could have performed as suggested only they had just seen him for the first time in 17 months. Did they make a life time decision over night? After all their son went through for 17 months, I can not see them making the decision to end his life in such short order, but I could be wrong. I shall not judge either way.