I like Lorentz as a fourth liner, he's been pretty solid in every way. Has speed, has been physical enough, has some size. 113 hits, 8 points, positive player... Nothing to complain about.
Kampf has been a good C, but isn't physical, overpaid for his place in the lineup. Good on the PK though. Not very good offensively. I'd replace him if the cost wasn't too high, but finding the right guy might not be easy, to replace the positives he does bring.
Dewar, I'm not too positive on. He's finally put up a couple of points, which is good, but he's the worst of the three 5v5, and lacks size... I mean, love his moxy.. but he's the guy you replace if you can. Olivier would be ideal, but Columbus likes him too much, and he seems to want $ above a 4th liner.
I like McBain as well, but not sure Utah would ever move him.
Third line has been working very well. Obviously we focus on C, but the question is, if we move Robertson off that line, does it stop working? Getting the right piece is key here. Krebs would be my ideal target.
RD... finding a Mo partner that works. Gudas I think is the best fit, of players on non-playoff teams. I'm not sure they move him though.