Mike Sullivan and the Penguins know Jeff Petry is capable of being a high-end defenseman, he just hasn't quite found his footing yet as he continues to adjust to his new environment and becomes more comfortable with the type of game the Penguins are trying to play.
The Penguins made significant changes on their blue line over the offseason that were heavily centered around bringing Petry in, but those changes aren't yet justified by Petry's performance.
In 15 games this season, Petry has three goals and four assists, with two of his goals coming on the power play.