The Pittsburgh Penguins have been heavily linked in trade rumors to Jason Robertson of the Dallas Stars.If that can't happen, though, it sounds like the Pens have a different plan to use their cap space.They're interested in Elias Pettersson of the Vancouver Canucks, according to local radio station 93.7 The Fan.The report indicates that the Canucks want Ben Kindel in return, "and that's made the trade hard to make," it adds.Kindel is a talented young player, and while Pettersson has skill, too, his contract is rough.He's still under contract for six more seasons, at $11.6 million per season.MORE: Dylan Larkin's trade list is causing a problemIt seems unlikely any team would trade for Pettersson without the Canucks retaining at least some of his salary.When Pettersson signed the deal a few