If you look at the Fenwick and Corsi scores, our best d-man has actually been Gilroy, with Campbell a close 2nd and with Gilroy not playing every game, I think that means Campbell is still our best. Campbell has been carrying Gilbert so far this season and I think with a better partner (who obviously isnt currently on the roster), Campbell could be better.
And if you look at those scores for our worst defender, Whitney is that guy though he hasnt played that many games. Kulikov is the worst of our regular d-men looking at both Fenwick & Corsi. All the stats suggest thats the case and based on what we've all seen too, it definitely correlates. If we can trade him while his value is still high because teams feel he still has potential, then its definitely worth doing so.
http://www.extraskater.com/players/on-ice?min_gp=1&pos=D&sort=fenwick_pct&team=fla