There is almost no chance DeVito has a better command of his offense than Dungey come Sept 1 2018. None.
Therefore, there IS ZERO chance that DeVito beats out Dungey.
And that is without calculating the intangibles that Dungey brings to the equation. There is a reason that the defense died on the vine after the FSU game. They weren't too tired or too beat up. Okay. Maybe to a small degree. But primarily, their spirit had been stripped, as they knew that Dungey was likely done for the year.
Dungey has a rare character whose persona crosses over and commands respect from both the offense and defense. DeVito might have that someday. I hope he does. But in the next 12 months, he is not going to be able to flash that cred like Dungey.
Let's not overthink this. DeVito will see the field next year for a few chosen possessions, blowouts and in the case of injury. That's it. That's how it should be.