Skinner in for Frederic. Frederic has been very invisible all playoffs, and we have more than enough physical players otherwise. If Skinner is a defensive liability in the early part of the game, you limit his mins the rest of the way. Pretty easy.
Stecher in for Kulak. This isn't anything against Kulak, but Stetcher is the "Nurse-whisperer" for whatever reason and Kulak hasn't been good at all on his off side. Stecher isn't big, but he is very fast, so can get back to pucks and move it before the forecheck eats him up. The increased play by Nurse more than accounts for the reduced quality in Stecher compared to Kulak.
The biggest thing though is that we need to at least saw-off on the goalie battle. Skinner has to be a positive GSAx goalie, or we won't win. This is, by far, the biggest need on the team. If Skinner doesn't let in goals he isn't supposed to, we win.