Cernak-best RD and a very solid defensive dman, so scoring isn't needed
Cirelli-thisnseason aside, good defensively and still.a ~45 point a year 2C/3C hybrid
Serg-still the 2nd best dman on the team and the injury was a clean break. He's young and should be fine.
All 3 are a little overpaid, but as they have 7 more years to pay off JBB's investment(with a steadily rising cap no less, further lessening their cap hit %), they will very likely remain as integral parts of the current and future core of the team.