To acquire Andy Greene, the New York Islanders gave up a 2021 second-round pick and AHL defenseman David Quenneville. I don't mind Lou throwing in Quenneville because the Isles already have a solid core of young defensemen.
Furthermore, Quenneville has had somewhat of a disappointing offensive season in the minors. In 32 games in the AHL and ECHL this season, Quenneville had recorded eight points and a -12 +/-. Of course, he is only 21 and may very well thrive in the Devils' system, but even if that happens, I think the Isles will still be content with guys like Ryan Pulock, Devon Toews, and Adam Pelech.