This trade is going to be a huge part of Chia's legacy, one way or another. It all comes down to where Larson goes from here. If his offence breaks out and he emerges as a legit #1 dman, or even a high end #2, then the trade was a success. Saves cap, gives us a great young dman locked up long term. Klefbom/Larson has the potential to be one of the best pairings in the league (emphasis on potential).
But if Larson's offence doesn't emerge, if his defence isn't as strong as it looks in NJ's system, if Greene is just making him look good like Fayne... then this is going down as one of the worst trades in team history.
Chia says Larson was the guy. Unlike Reinhart, he scouted him himself. Out of all the potential RHD out there he could get without giving up McDavid, Larson was the one he wanted. This trade is all on Chia, and we'll know in a few years if he's the smartest guy in the room, or as big an idiot as he looks right now.