That's a bad deal for you for the reason that Instant Karma suggested.
Yak is in the EDM doghouse and a bad trade away from bolting to KHL (hope he doesn't because the talent is obvious). In the meantime, Gallagher is doing quite well with Galchenyuk and Eberle is steady (if not great).
If you can get him to offer Stepan and Kunitz, that works better for you.
League 1: Dobber TIII (Norris), Yahoo Roto, 13 Teams
4C, 4LW, 4RW, 6D, 2G start; 5 Bench
Skaters: G, A, +/-, SOG, PPP, Hits
Goalies: W, Saves, GAA
F: Parise, Marleau, E Kane, E Staal, Hudler,Thornton, Hartnell, Vanek, J Williams, Jagr, Stempniak, Hagelin, J Jokinen, Clutterbuck
D: OEL, Krug, Suter, Edler, Sekera, Daley, Gudas
G: Holtby, Rinne, M Smith, Khudobin