WAR Models have always been bullish on 1st pairing defensemen on crappy teams. Chychrun is also among the worst this season. Does that make the GM who trades a 1st+ for him foolish as well? Chiarot is not a 1st pairing defenseman but has been deployed like one. He's actually decent on a second pairing, provides intangibles & plays a playoffs-style hockey that actually wins you rounds.
Yep, Chiarot may look like a black hole but he really isn't, if he's played on the 2nd pair with the right partner, that can be a god pairing