I feel the value is too low right now to trade him. If Jaylen misses time and Porzingis starts to play well it would make sense to deal him to a contender that can give you an expiring and a few picks. Some contender always makes a move near deadline. If Jaylen is healthy I ride it out and let KP expire or resign if it's a team friendly deal. I'm not trading a talent like Porzingis in this turbulent Eastern Conference unless I'm sure not to make playoffs.
As I've thought about it, I tend to agree (unless there is something the Celtic medical staff know that we don't). Zinger's upside is still tremendous. He's a unique player that can really raise the ceiling of this team. He's likely more valuable too us than what any other team would be willing to trade for him.
I agree with you both and @tonydelk as well. If there's no trade interest and the only way to trade him is to attach multiple picks or take on another bad contract, I don't see the point.
If you can maybe trade KP and pick(s) to acquire 1-2 legit players (even if it's simply 1 starter and 1 role player) I would consider it, but I don't think that'll happen tbh given his durability issues and current PVS. Something like KP + picks to Utah for 2 or all of Kessler/Sexton/Sensabaugh, or similar. But I don't think Utah does it and I don't see another team coughing up a similar package.
I'd just hold on to him. But make no mistake, they HAVE to add another PF/C somewhere (either draft, FA or trade). Whether it's someone like Gafford in a Jrue trade, or maybe drafting someone at 28 or 32.