It's almost impossible to predict right now what defensive players (if any) the Bears will target till we know if Marinelli is going to be our DC next season.
Emery's draft board right now for defense is probably a blank slate... as it should be.
Once we know Marinelli's fate we can start slotting in some possible defensive picks though I would suspect and hope that offensive needs (OL, TE, speed WR) will dominate our draft this year.