Mike Colligan delivers a monster piece here.
This year, the unit struggled throughout the regular season, (killing at only 80 percent, 25th in the league), but has been an underrated strength for the Penguins so far in their matchup with the Islanders (88%).
So what do all of these numbers mean? Why the Jekyll and Hyde act?
Assistant coach Tony Granato has directed the penalty kill for years and the system rarely varies from night to night. Even the personnel — Craig Adams, Pascal Dupuis, Matt Cooke up front; Brooks Orpik, Paul Martin, Kris Letang on defense — is pretty much the same as its always been. The Penguins lost penalty killers Jordan Staal and Zbynek Michalek in the offseason, but both players were big reasons the PK unit failed in prior playoff campaigns.
One explanation is goaltending.
It is a great breakdown. Go here to read the whole thing, Colligan: How Does the Penguins Penalty Killer Work?