Leipsic was waived by both Vegas and Vancouver, played a few games in LA and then was not re-signed. He now has a contract and is playing in Washington. One team's trash is another team's fourth liner. Lindholm has played 4 games in Boston, that is not actually a good indication that he has value around the league.
Par Lindholm has one goal and 13 points in 69 career games. Your team is completely sewered if he has to play on the third line or play on the offensive side of the puck at all. If he has above average hands, he sure as hell doesn't use them to generate any offense. Contending teams would hold on to players like Petan (and Leipsic) as depth and injury fill ins for scoring wingers. Unfortunately for Petan, he's not very good and was passed in the lineup by other guys like Timashov and Mikheyev.
I agree that Petan is not an NHL player and I expect him to play in Europe next year after having no takers in the NHL. But I cannot for the life of me understand why Par Lindholm is the reminder of a boneheaded decision. He barely played in Winnipeg at all after the trade and both teams effectively got nothing out of it. Boston has decided to give him a spot, but you're already crowing about his success about drawing into four games. It's cool if you want to blast Dubas for stuff, but I think that you're tripping over your agenda and forcing it into the conversation where it doesn't need to be. Petan sucks, that's where the story ends tbh.