With the 2013 NHL playoffs underway, the pressure around the league has certainly ratcheted up a notch—it's during the games that players don't get paid for where they actually earn their money. Some are just better at earning their keep than others.
One or two poor playoff performances might be permissible, depending on the size of the team's "championship window." However, some squads and players are just running out of time.
There are a handful of players in the postseason right now that just can't afford to put up forgettable performances for various reasons. Some guys have had question marks by their names for a while, while others were brought to their team on a tryout basis.
It takes a special kind of team to bring a player back after vanishing during a playoff series when they were brought in to make a difference during the postseason, after all.