Thought I'd bring up the only line that may look like it did last year. Seems like there's a lot of talk about how its the best 4th line in hockey but in the same breath Thornton needs replaced. I agree that he's lost a step, not the same since the beat down and maybe as a smaller guy faired better 5 yrs ago when the avg enforcer had 20 lbs on him not 50. And I'm fine if he's replaced.
However, he wouldn't be replaced with a callup with any skill, there will be a fighter on that line. if anyone thinks that mgmt will let their top D or top LW handle the other teams goons, well you're just crazy.
So, if you can name a 4th liner that can step in via minors or trade/ufa that upgrades toughness and maintains the skill that the 4th line has please do, I'm sure there are some, i just can't think of them.