In a full keeper and if you're not competing for the championship this year, this is a no brainer for me. Couture is an emerging monster by your settings.
I'd consider doing this, but keep focusing on rebuilding your goalies for the rest of the year because neither Markstrom nor Bernier are 100% sure things yet.
16-team Keeper, Keep 7
Cats: G, A, P, +/-, BS, PIM, PPG, PPA, PPP, SHP, GWG, SOG, W, L, GAA, SV%, SHO
C: Giroux (RW), Shore, Fisher, Schwartz
LW: Couture (C), Benn (C), Killorn (C), Malone
RW: Yakupov, Voracek, Clowe (LW), Downie (LW), Vrbata, Hornqvist, Callahan
D: Schultz, Gudas, Gardiner, Kindl, Trouba, Ballard
G: Rask, Emery, Lehner, Lack