The reality is that you want your best players playing more, and the 4th line will get fewer minutes. So putting a Backlund, or Zary, or Frost on the fourth line is rarely the move, as opposed to putting more skill on your top 3 lines who almost always get more ice time.
If you decide to play your 4th line more, it means that you are taking time away from your top 3 lines.
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