wow...I, just, wow.
You should go back and rewatch the game. Knowing the outcome, the emotions don't flow the same. Maybe you'll see better, because pretty much none of your descriptions match reality.
If you read the Mink article, Harris pointed to himself for that missed post pattern. He was surprised the ball was on him so quick (used to the Dungey slow trigger) and wasn't ready for Devito's read. Harris acknowledged fault.
The Custis throw was a back shoulder. Devito released it when Custis was on the 14 yard line, and it was meant to be in a place only Custis could catch it. Executed as designed.
Devito attacked downfield, but he also was throwing 15 yard darts. Those intermediate routes started opening up. The UNC defense was on its heels because it suddenly had to defend more of the field.
The book on Dungey is out. Stay disciplined in the rush, keep a spy on him, force him to accurately throw more than a few passes in a row and dare him to beat you deep. It keeps lots of defenders in the box because the defense doesn't have to stretch. And voila - the Syracuse offense is inefficient and prone to stalling out.