5. Byerson Cockrell
When Charles Jackson went down with a torn MCL, Pelini lost his likely starting nickel back.
He was working at cornerback, but fortunately Daniel Davie and Jonathan Rose were waiting in the wings.
Now it appears that Nathan Gerry and Corey Cooper are the probable players to take the field at safety against Florida Atlantic, keeping No. 28 where Jackson used to be.
If he were to go down, the coaches would be scrambling to fill one of the most important positions in Pelini’s scheme.