I understand the "be a good teammate, winning is all that matters, go team go!' mindset. I don't agree with it, but I understand it.
But 2016 Sergei Plotnikov is not 2015 Craig Adams. He is not some north american plug who, when he's done, is just going to go home to his cabin on the lake and tell tales about his 4th line exploits.
This is a guy who, before he ever signed with the Penguins, proved he was not about money, but was about team and winning, WHEN HE BOUGHT OUT HIS CONTRACT TO COME HERE.
After that, it becomes less "player who is done and is being sat until his contract is up" and more "**** you Dan Bylsma, we're going to fire you, but not until every job is taken, first."
If you have no intention of playing him, let him go. Let him go to the KHL, let him sign a contract, and let him earn a living. Holding him here simply because you don't like how he handled being benched for some nobody is petty. It is not strong.