If not up to Karlsson's level then he is a pretty good bet as a close second. I wouldn't make that trade.
10 Team Yahoo Roto
Keep 6F, 3D, 1G (to max 4 years)
4C,4LW,4RW,6D,2G,5BN,2IR Roto-play 90games/position
Player: G, A, +/-, PIM, PPP, SHP, GWG, SOG, FW
Goalie: W, GAA, SV, SV%, SHO
C: 4-Backstrom, 2-Getzlaf, Kesler, Eller, Johansen (RW)
LW: 3-Zetterberg(c), 2-Hall, 3-Benn(c), Moulson
RW: 2-P.Kane(c), Parenteau, Ryder, Brouwer, Alfredsson
D: 3-Edler, 2-Yandle, 2-Subban, Del Zotto, Carlson, J.Faulk, Hedman
G: 3-Quick, Holtby, Bernier, Reimer
#- denotes number of years I have kept a player.