It makes sense that the boy got released and later died of a cold. Gyro's father told him no one knows which side of the net the ball will fall on and he shouldn't get sentimental about these things.
The boy would've got released because of an amnesty regardless of Gyro's actions. The boy still died even with the amnesty.
This is definitely my favorite part, but I like to rank Jojo in tiers:
T3: 7,6,5
T2: 4,3,2
T1: 1