The Jazz have massively more information on Hendricks than the rest of the league, so any attempt by the Jazz to trade him would torpedo his value. Pretty much a market for lemons problem taken its most extreme. The Jazz cannot try to trade Hendricks without destroying his value so they won't trade him even if they don't think he's a great fit with the rest of the roster or anything.
With regards to Hendricks as a player, it's hard to tell. I have no idea how he looks physically right now after his surgery and recovery and how much weight he's put on. He's probably a pure PF now which is not amazing for the roster considering how many bigs we already have, but it's fine. He's tough to evaluate because he's a defensive player mostly, but he really doesn't play hard in low stakes games like summer league or the G-League and he's mostly played in low stakes games in his career. He was looking really good in the first three games of the season before he broke his leg. Has a lot of defensive upside, needs to get a lot better at dribbling and passing though to utilize his size. Was showing some passing flashes to start the season which was nice. We'll see how it goes for him.