We run a 4-3 under and it'll be just fine with a couple of extra additions. A pass rushing three-tech who can play early downs. A slight upgrade at the WILL.
The nice thing about this defense and their personnel is they can keep a consistent enough pass pressure with just their front four. Very unique. That's the way Pete likes it. The Hawks have a couple key free agents this season in Branch and Jones. Don't think that will affect how they run things next season. They will find their pieces and plug in and go.
I thought about the 3-4 as well. The LBs in peticular are a good fit. However I don't think PC is a big fan of it. What I do see is a hybrid use of a variant of the 46 and the Bandit.
The logic would be play off the size and speed of the d and the large defensive backs
All 3 of the linebackers have very good to excellent speed (assuming we use Smith) and it would be a nightmare to scheme against