Nickel is one of the most important positions in 3-4. He will be on the field a lot even if that’s all he plays. We could effectively have 2 nickels on the field a decent bit in “dime” coverage. Rowe, Jammie, etc can all play the other spot.
bigger question is where does Luvu go in nickel if Shaq is ILB. Likely means he’s at OLB and haynes/barno more backing up Burns or 3rd down specialists.