Duncan is among four combatants vying to replace Mike White as the Hilltoppers’ quarterback.
Schwenke helped Notre Dame appear in the BCS National Championship to cap the 2012 season.
Antonio Williams will move closer to home to use his final two years of eligibility on the football field.
After years without one, a college football-themed video game is coming in 2020.
Dillon will be eligible immediately in 2018 as a graduate transfer.