I don't think losing Krug is going to damage the defensive side of things, though . My preferred move is to sign someone like Brenden Dillon to play 18-20 minutes of good D on the left side, at a reasonable contract number and spend what you would on Krug or OEL on scoring.
Well I suppose that's true provided one of the kids can take his place & do at least as well (which isn't saying much especially on the "D" side of things). That seems to be the big question and maybe it is time to find out.