Penguins General Manager Jim Rutherford appears to have made it quite clear to those who have interviewed him, he wants four lines that can score.
Over the last six seasons, scoring was the last thing the fourth line was going to do with Craig Adams as the anchor.
This upcoming season barring an injury or a medical relapse for Pascal Dupuis, there's probably one spot in the top three lines open for Beau Bennett and Sergei Plotnikov, thus leaving one of them to be in the unfortunate position of being a fourth line winger.